TYPICAL APPLICATION
FEATURES
APPLICATIONS
DESCRIPTION
Low Power Fully Differential Input/Output Amplifi er/Driver
The LTC ®6403-1 is a precision, very low noise, low dis-tortion, fully differential input/output amplifi er optimized
for 3V to 5V, single supply operation. The LTC6403-1 is unity gain stable. The LTC6403-1 closed-loop bandwidth extends from DC to 200MHz. In addition to the normal unfi ltered outputs (+OUT and –OUT), the LTC6403-1 has a built-in 44.2MHz differential single-pole low pass fi lter and an additional pair of fi ltered outputs (+OUTF, and –OUTF). An input referred voltage noise of 2.8nV/√H
z enables the LTC6403-1 to drive state-of-the-art 14- to 18-bit ADCs while operating on the same supply voltage, saving system cost and power. The LTC6403-1 maintains its performance for supplies as low as 2.7V. It draws only 10.8mA, and has a hardware shutdown feature which reduces current consumption to 170μA.
The LTC6403-1 is available in a compact 3mm × 3mm 16-pin leadless QFN package and operates over a –40°C to 85°C temperature range.
Single-Ended Input to Differential Output with Common Mode Level Shifting
■
Very Low Distortion: (2V P-P , 3MHz): –95dBc
■ Fully Differential Input and Output ■ Low Noise: 2.8nV/√Hz Input-Referred ■ 200MHz Gain-Bandwidth Product ■ Slew Rate: 200V/μs
■ Adjustable Output Common Mode Voltage ■ Rail-to-Rail Output Swing
■ Input Range Extends to Ground ■ Large Output Current: 60mA (Typ)■ DC Voltage Offset <1.5mV (Max)■
10.8mA Supply Current
■ 2.7V to 5.25V Supply Voltage Range ■ Low Power Shutdown ■ Tiny 3mm × 3mm × 0.75mm 16-Pin QFN Package
■
Differential Input A/D Converter Driver
■ Single-Ended to Differential Conversion/Amplifi cation ■ Common Mode Level Translation
■
Low Voltage, Low Noise, Signal Processing
1.5V
64031 TA01
1V P-P
1.5V
1V P-P
FREQUENCY (MHz)
1
–120
D I S T O R T I O N (d B c )
–110–90
–70–5010
100
64031 TA01b
–30
–100
–80–60–40Harmonic Distortion vs Frequency
LTC6403-1 DC ELECTRICAL CHARACTERISTICS
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V –) ................................5.5V Input Voltage
(+IN, –IN, V OCM , S H D N ) (Note 2)
...................V + to V –Input Current
(+IN, –IN, V OCM , S H D N ) (Note 2)
.....................±10mA Output Short-Circuit Duration (Note 3) ............Indefi nite Operating Temperature Range
(Note 4) ...............................................–40°C to 85°C Specifi ed Temperature Range
(Note 5) ...............................................–40°C to 85°C Junction Temperature ...........................................150°C Storage Temperature Range ...................–65°C to 150°C
(Note 1)
The ● denotes the specifi cations which apply
over the full operating temperature range, otherwise specifi cations are at T A = 25°C, V + = 3V, V –
= 0V, V CM = V OCM = V ICM = Mid-Supply, V S H D N = OPEN, R I = 402Ω, R F = 402Ω, R L = OPEN, R BAL = 100k (See Figure 1) unless otherwise noted. V S is defi ned as
(V + – V –). V OUTCM is defi ned as (V +OUT + V –OUT )/2. V ICM is defi ned as (V +IN + V –IN )/2. V OUTDIFF is defi ned as (V +OUT – V –OUT ). V INDIFF is defi ned as (V INP – V INM ).
SYMBOL PARAMETER
CONDITIONS MIN TYP MAX UNITS V OSDIFF
Differential Offset Voltage (Input Referred)
V S = 2.7V
V S = 3V V S = 5V ●●●
±0.4±0.4±0.4±1.5±1.5±2
mV mV mV ΔV OSDIFF /ΔT Differential Offset Voltage Drift (Input Referred)
V S = 2.7V V S = 3V V S = 5V
111
μV/°C μV/°C μV/°C
PIN CONFIGURATION
1617
151413
5678TOP VIEW
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN 9
1011124
321SHDN V +V –V OCM
V –
V +V +V –
N C
+I N –O U T –O U T F
N C
–I N
+O U T
+O U T F
T JMAX = 150°C, θJA = 160°C/W, θJC = 4.2°C/W
EXPOSED PAD (PIN 17) IS V –, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED TEMPERATURE RANGE LTC6403CUD-1#PBF LTC6403IUD-1#PBF
LTC6403CUD-1#TRPBF LTC6403IUD-1#TRPBF LDBM LDBM
16-Lead (3mm × 3mm) Plastic QFN 16-Lead (3mm × 3mm) Plastic QFN
0°C to 70°C –40°C to 85°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.Consult LTC Marketing for information on non-standard lead based fi nish parts.For more information on lead free part marking, go to: www.linear/leadfree/
This product is only offered in trays. For more information go to: www.linear/packaging/
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I B Input Bias Current (Note 6)V S = 2.7V
V S = 3V
V S = 5V ●
●
●
–25
–25
–25
–7.5
–7.5
–7.5
μA
μA
μA
I OS Input Offset Current (Note 6)V S = 2.7V
V S = 3V
V S = 5V ●
●
●
±0.2
±0.2
±0.2
±5
±5
±5
μA
μA
μA
R IN Input Resistance Common Mode
Differential Mode 1.7
14
MΩ
kΩ
C IN Input Capacitance Differential Mode1pF e n Differential Input Referred Noise Voltage Density f = 1MHz 2.8nV/√H z i n Input Noise Current Density f = 1MHz 1.8pA/√H z
e nVOCM Input Referred Common Mode Output Noise
Voltage Density f = 1MHz, V OCM Shorted to Ground,
V+ = 1.5V, V– = –1.5V
17nV/√H z
V ICMR Input Signal Common Mode Range (Note 7)V S = 3V
V S = 5V ●
●
1.6
3.6
V
V
CMRRI Input Common Mode Rejection Ratio
(Input Referred) ΔV ICM/ΔV OSDIFF (Note 8)V S = 3V, ΔV ICM = 0.75V
V S = 5V, ΔV ICM = 1.25V
●
●
50
50
72
72
dB
dB
CMRRIO Output Common Mode Rejection Ratio (Input
Referred) ΔV OCM/ΔV OSDIFF (Note 8)
V S = 5V, ΔV OCM = 2V●5090dB
PSRR Differential Power Supply Rejection
(ΔV S/ΔV OSDIFF) (Note 9)
V S = 2.7V to 5.25V●6097dB
PSRRCM Output Common Mode Power Supply Rejection
(ΔV S/ΔV OSCM) (Note 9)
V S = 2.7V to 5.25V●4563dB G CM Common Mode Gain (ΔV OUTCM/ΔV OCM)V S = 5V, ΔV OCM = 2V●1V/V ΔG CM Common Mode Gain Error (100 • (G CM – 1))V S = 5V, ΔV OCM = 2V●–0.4–0.10.3%
BAL Output Balance (ΔV OUTCM/ΔV OUTDIFF)ΔV OUTDIFF = 2V
Single-Ended Input
Differential Input ●
●
–63
–66
–45
–45
dB
dB
V OSCM Common Mode Offset Voltage (V OUTCM – V OCM)V S = 2.7V
V S = 3V
V S = 5V ●
●
●
±10
±10
±10
±25
±25
±25
mV
mV
mV
ΔV OSCM/ΔT Common Mode Offset Voltage Drift V S = 2.7V
V S = 3V
V S = 5V 20
20
20
μV/°C
μV/°C
μV/°C
V OUTCMR Output Signal Common Mode Range
(Voltage Range for the V OCM Pin) (Note 7)V S = 3V
V S = 5V
●
●
1.1
1.1
2
4
V
V
R INVOCM Input Resistance, V OCM Pin●152332kΩV OCM Voltage at the V OCM Pin (Self-Biased)V S = 3V, V OCM = Open● 1.45 1.5 1.55V
V OUT Output Voltage, High, Either Output Pin (Note 10)V S = 3V, I L = 0
V S = 3V, I L = 5mA
V S = 3V, I L = 20mA ●
●
●
190
190
340
300
300
490
mV
mV
mV
V S = 5V, I L = 0
V S = 5V, I L = 5mA V S = 5V, I L = 20mA ●
●
●
170
195
380
300
340
550
mV
mV
mV
LTC6403-1 DC ELECTRICAL CHARACTERISTICS The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T A = 25°C, V+ = 3V, V– = 0V, V CM = V OCM = V ICM = Mid-Supply, V S H D N = OPEN, R I = 402Ω, R F = 402Ω, R L = OPEN, R BAL = 100k (See Figure 1) unless otherwise noted. V S is defi ned as
(V+ – V–). V OUTCM is defi ned as (V+OUT + V–OUT)/2. V ICM is defi ned as (V+IN + V–IN)/2. V OUTDIFF is defi ned as (V+OUT – V–OUT). V INDIFF is defi ned as (V INP – V INM).
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V OUT Output Voltage, Low, Either Output Pin (Note 10)V S = 3V, I L = 0
V S = 3V, I L = –5mA
V S = 3V, I L = –20mA ●
●
●
150
165
210
220
245
300
mV
mV
mV
V S = 5V, I L = 0
V S = 5V, I L = –5mA V S = 5V, I L = –20mA ●
●
●
165
175
225
265
275
350
mV
mV
mV
I SC Output Short-Circuit Current, Either Output Pin
(Note 11)V S = 2.7V
V S = 3V
V S = 5V
●
●
●
±30
±30
±35
±58
±60
±74
mA
mA
mA
A VOL Large-Signal Voltage Gain V S = 3V90d
B V S Supply Voltage Range● 2.7 5.25V
I S Supply Current V S = 2.7V
V S = 3V
V S = 5V ●
●
●
10.7
10.8
11
11.8
11.8
12.1
mA
mA
mA
I S H D N Supply Current in Shutdown V S = 2.7V
V S = 3V
V S = 5V ●
●
●
0.16
0.17
0.26
0.5
0.5
1
mA
mA
mA
V IL S H D N Input Logic Low V S = 2.7V to 5V●V+ – 2.1V V IH S H D N Input Logic High V S = 2.7V to 5V●V+ – 0.6V R S H D N S H D N Pull-Up Resistor V S = 5V, V S H D N = 2.9V to 0V406690kΩt ON Turn-On Time V S = 3V, V S H D N = 0.5V to 3V4μs t OFF Turn-Off Time V S = 3V, V S H D N = 3V to 0.5V350ns
The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T A = 25°C, V+ = 3V, V– = 0V, V CM = V OCM = V ICM = Mid-Supply, V S H D N = OPEN, R I = 402Ω, R F = 402Ω, R T = 25.5Ω, unless otherwise noted (See Figure 2). V S is defi
ned (V+ – V–). V OUTCM is defi ned as (V+OUT + V–OUT)/2. V ICM is defi ned as (V+IN + V–IN)/2. V OUTDIFF is defi ned as (V+OUT – V–OUT). V INDIFF is defi ned as (V INP – V INM). LTC6403-1 AC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SR Slew Rate V S = 3V
V S = 5V 200
200
V/μS
V/μS
GBW Gain-Bandwidth Product V S = 3V
V S = 5V 200
200
MHz
MHz
f3dB–3dB Frequency (See Figure 2)V S = 3V
V S = 5V ●
●
100
100
200
200
MHz
MHz
HD2 HD33MHz Distortion V S = 3V, V OUTDIFF = 2V P-P
Single-Ended Input
2nd Harmonic
3rd Harmonic
–97
–95
dBc
dBc
HD2 HD33MHz Distortion V S = 3V, V OUTDIFF = 2V P-P
Differential Input
2nd Harmonic
3rd Harmonic
–106
–94
dBc
dBc
LTC6403-1 DC ELECTRICAL CHARACTERISTICS The ● denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at T A = 25°C, V+ = 3V, V– = 0V, V CM = V OCM = V ICM = Mid-Supply, V S H D N = OPEN, R I = 402Ω, R F = 402Ω, R L = OPEN, R BAL = 100k (See Figure 1) unless otherwise noted. V S is defi ned as
(V+ – V–). V OUTCM is defi ned as (V+OUT + V–OUT)/2. V ICM is defi ned as (V+IN + V–IN)/2. V OUTDIFF is defi ned as (V+OUT – V–OUT). V INDIFF is defi ned as (V INP – V INM).
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.
Note 2: The inputs +IN, –IN are protected by a pair of back-to-back diodes. If the differential input voltage exceeds 1.4V, the input current should be limited to less than 10mA. Input pins (+IN, –IN, V OCM, and S H D N) are also protected by steering diodes to either supply. If the inputs should exceed either supply voltage, the input current should be limited to less than
10mA.
Note 3: A heat sink may be required to keep the junction temperature below the absolute maximum rating when the output is shorted
indefi nitely. Long term application of output currents in excess of the absolute maximum ratings may impair the life of the device.
Note 4: The LTC6403-1 is guaranteed functional over the operating temperature range –40°C to 85°C.
Note 5: The LTC6403C-1 is guaranteed to meet specifi ed performance from 0°C to 70°C. The LTC6403C-1 is designed, characterized, and expected to meet specifi ed performance from –40°C to 85°C but is
not tested or QA sampled at these temperatures. The LTC6403I-1 is guaranteed to meet specifi ed performance from –40°C to 85°C.
Note 6: Input bias current is defi ned as the average of the input currents fl owing into Pin 6 and Pin 15 (–IN, and +IN). Input offset current is defi ned as the difference of the input currents fl owing into Pin 15 and Pin 6 (I OS = I B+ – I B–)
Note 7: Input common mode range is tested using the test circuit of Figure 1 by measuring the differential gain with a ±1V differential output with V ICM = mid-supply, and also with V ICM at the input common mode range limits listed in the Electrical Characteristics table, verifying that the differential gain has not deviated from the mid supply common mode input case by more than 1%, and the common mode offset (V OSCM) has not deviated from the mid-supply case by more than ±10mV.The voltage range for the output common mode range is tested using the test circuit of Figure 1 by applying a voltage on the V OCM pin and testing at both mid supply and at the Electrical Characteristics table limits to verify that the differential gain has not deviated from the mid supply V OCM case by more than 1%, and the common mode offset (V OSCM) has not deviated by more than ±10mV from the mid supply case.
Note 8: Input CMRR is defi ned as the ratio of the change in the input common mode voltage at the pins +IN or –IN to the change in differential input referred voltage offset. Output CMRR is defi ned as the ratio of the change in the voltage at the V OCM pin to the change in differential input referred voltage offset. These specifi cations are strongly dependent on feedback ratio matching between the two outputs and their respective inputs, and it is diffi cult to measure actual amplifi er performance. (See “The Effects of Resistor Pair Mismatch” in the General Applications Section of this datasheet.) For a better indicator of actual amplifi er performance independent of feedback component matching, refer to the PSRR specifi cation.
Note 9: Differential power supply rejection (PSRR) is defi ned as the ratio of the change in supply voltage to the change in differential input referred voltage offset. Common mode power supply rejection (PSRRCM) is
defi ned as the ratio of the change in supply voltage to the change in the common mode offset, V OUTCM – V OCM.
Note 10: Output swings are measured as differences between the output and the respective power supply rail.
Note 11: Extended operation with the output shorted may cause junction temperatures to exceed the 150°C limit and is not recommended. See Note 3 for more details.
Note 12: A resistive load is not required when driving an AD converter with the LTC6403-1. Therefore, typical output power is very small. In order to compare the LTC6403-1 with amplifi ers that require 50Ω output load, the LTC6403-1 output voltage swing driving a given R L is converted to OIP3 as if it were driving a 50Ω load. Using this modifi ed convention, 2V P-P is by defi nition equal to 10dBm, regardless of actual R L.
The ● denotes the specifi cations which apply
over the full operating temperature range, otherwise specifi cations are at T A = 25°C, V+ = 3V, V– = 0V, V CM = V OCM = V ICM = Mid-Supply, V S H D N = OPEN, R I = 402Ω, R F = 402Ω, R T = 25.5Ω, unless otherwise noted (See Figure 2). V S is defi ned (V+ – V–). V OUTCM is defi ned as (V+OUT + V–OUT)/2. V ICM is defi ned as (V+IN + V–IN)/2. V OUTDIFF is defi ned as (V+OUT – V–OUT). V INDIFF is defi ned as (V INP – V INM). LTC6403-1 AC ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IMD Third-Order IMD at 10MHz
f1 = 9.5MHz, f2 = 10.5MHz
V S = 3V, V OUTDIFF = 2V P-P Envelope–72dBc OIP3Equivalent OIP3 at 3MHz (Note 12)V S = 3V48dBm
t S Settling Time
2V Step at Output V S = 3V, Single-Ended Input
1% Settling
0.1% Settling
20
30
ns
ns
NF Noise Figure, f = 3MHz R SOURCE = 804Ω, R I = 402Ω,
R F = 402Ω, V S = 3V
R SOURCE = 200Ω, R I = 100Ω,
R F = 402Ω, V S = 3V 10.8
8.9
dB
dB
f3dBFILTER Differential Filter 3dB Bandwidth44.2MHz
FREQUENCY (MHz)
–20G A I N (d B )
4050–30–40
3002010–100.1
10100
1000
64031 G08
–501
TEMPERATURE (°C)
–60D I F F E R E N T
I A L O F F S E T V O L T A G E (m V )
00.4100
64031 G01–0.4–0.8
–202060–400
4080
0.8–0.20.2–0.6
0.6TEMPERATURE (°C)
–60C O M M O N M O D E O F F
S E T V O L T A G E (m V )
04100
64031 G 02
–4–8
–202060–400
4080
8
–22–6
6
S UPPLY VOLTAGE (V)
T O T A L S U P P L Y C U
R R E N T (m A )
246810121
23464031 G03
5
S HDN VOLTAGE (V)
T O T A L S U P P L Y C U R R
E N T (m A )
2468120.5
1.0 1.5
2.064031 G04
2.5
3.0
10S UPPLY VOLTAGE (V)
2503003504
64031 G05
2001501
2
3
5
10050
S H U T D O W N S U P P L Y C U R R E N T (μA )
FREQUENCY (MHz)
1
–20G A I N (d B )
–15–10–50101001000
64031 G06
–25
–30–35
–40
5TYPICAL PERFORMANCE CHARACTERISTICS
ios 12.1Differential Offset Voltage vs Temperature
Common Mode Offset Voltage vs Temperature
Supply Current vs Supply Voltage
Supply Current vs S H D N Voltage
Shutdown Supply Current vs Supply Voltage
Frequency Response vs Load Capacitance
Frequency Response vs Gain
A V (V/V)R I (Ω)R F (Ω)1402402240280654022k 10
402 4.02k 204028.06k 100
402
40.2k
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