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PDF ADA4941-1 Data sheet ( Hoja de datos )
| Número de pieza | ADA4941-1 | |
| Descripción | Single Supply Differential 18-Bit ADC Driver | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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Single-ended-to-differential converter
Excellent linearity
Distortion −110 dBc @100 KHz for VO, dm = 2 V p-p
Low noise: 10.2 nV/√Hz, output-referred, G = 2
Extremely low power: 2.2 mA (3 V supply)
High input impedance: 24 MΩ
User-adjustable gain
High speed: 31 MHz, −3 dB bandwidth (G = +2)
Fast settling time: 300 ns to 0.005% for a 2 V step
Low offset: 0.8 mV max, output-referred, G = 2
Rail-to-rail output
Disable feature
Wide supply voltage range: 2.7 V to 12 V
Available in space-saving, 3 mm × 3 mm LFCSP
APPLICATIONS
Single-supply data acquisition systems
Instrumentation
Process control
Battery-power systems
Medical instrumentation
GENERAL DESCRIPTION
The ADA4941-1 is a low power, low noise differential driver for
ADCs up to 18 bits in systems that are sensitive to power. The
ADA4941-1 is configured in an easy-to-use, single-ended-to-
differential configuration and requires no external components
for a gain of 2 configuration. A resistive feedback network can
be added to achieve gains greater than 2. The ADA4941-1
provides essential benefits, such as low distortion and high
SNR, that are required for driving high resolution ADCs.
With a wide input voltage range (0 V to 3.9 V on a single 5 V
supply), rail-to-rail output, high input impedance, and a user-
adjustable gain, the ADA4941-1 is designed to drive single-
supply ADCs with differential inputs found in a variety of low
power applications, including battery-operated devices and
single-supply data acquisition systems.
Single-Supply, Differential
18-Bit ADC Driver
ADA4941-1
FUNCTIONAL BLOCK DIAGRAM
FB 1
REF 2
V+ 3
OUT+ 4
Figure 1.
8 IN
7 DIS
6 V–
5 OUT–
–60
–65
–70
–75
–80
–85
–90
–95
–100
–105
–110
–115
–120
–125
–130
–135
–140
0.1
HD3
HD2
HD2
HD3
1
10
VO = 6V p-p
VO = 2V p-p
100 1000
FREQUENCY (kHz)
Figure 2. Distortion vs. Frequency at Various Output Amplitudes
The ADA4941-1 is ideal for driving the 16-bit and 18-bit
PulSAR® ADCs such as the AD7687, AD7690, and AD7691.
The ADA4941-1 is manufactured on ADI’s proprietary second-
generation XFCB process, which enables the amplifier to
achieve 18-bit performance on low supply currents.
The ADA4941-1 is available in a small 8-lead LFCSP as well as a
standard 8-lead SOIC and is rated to work over the extended
industrial temperature range, −40°C to +125°C.
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113 ©2006–2009 Analog Devices, Inc. All rights reserved.
1 page  
ADA4941-1
TA = 25°C, VS = ±5 V, OUT+ connected to FB (G = 2), RL, dm = 1 kΩ, REF = 0 V, unless otherwise noted.
Table 3.
Parameter
DYNAMIC PERFORMANCE
−3 dB Bandwidth
www.datasheet4u.com
Overdrive Recovery Time
Slew Rate
Settling Time 0.005%
NOISE/DISTORTION PERFORMANCE
Harmonic Distortion
RTO Voltage Noise
Input Current Noise
DC PERFORMANCE
Differential Output Offset Voltage
Differential Input Offset Voltage Drift
Single-Ended Input Offset Voltage
Single-Ended Input Offset Voltage Drift
Input Bias Current
Input Offset Current
Gain
Gain Error
Gain Error Drift
INPUT CHARACTERISTICS
Input Resistance
Input Capacitance
Input Common-Mode Voltage Range
Common-Mode Rejection Ratio (CMRR)
OUTPUT CHARACTERISTICS
Output Voltage Swing
Output Current
Capacitive Load Drive
POWER SUPPLY
Operating Range
Quiescent Current
Quiescent Current—Disable
Power Supply Rejection Ratio (PSRR)
+PSRR
−PSRR
DISABLE
DIS Input Voltage
DIS Input Current
Turn-On Time
Turn-Off Time
Conditions
VO = 0.1 V p-p
VO = 2.0 V p-p
+Recover/−Recovery
VO = 2 V step
VO = 12 V p-p step
fC = 40 kHz, VO = 2 V p-p, HD2/HD3
fC = 100 kHz, VO = 2 V p-p, HD2/HD3
fC = 1 MHz, VO = 2 V p-p, HD2/HD3
f = 100 kHz
f = 100 kHz
Min
23
5.2
Amp A1 or Amp A2
IN and REF
IN and REF
(+OUT − −OUT)/(IN − REF)
1.98
−1
IN and REF
IN and REF
CMRR = VOS, dm/VCM, VREF = VIN,
VCM = −4.8 V to +3.9 V, G = 4
Each single-ended output, G = 4
20% overshoot, VO, dm = 200 mV p-p
−4.8
85
VS − 0.25
2.7
PSRR = VOS, dm/ΔVS, G = 4
Disabled, DIS = High
Enabled, DIS = Low
Disabled, DIS = High
Enabled, DIS = Low
87
87
Typ
32
7.5
200/650
26
980
−118/−119
−109/−112
−84/−75
10.2
1.6
0.2
1.0
0.1
0.3
3
0.1
2
1
24
1.4
105
VS ± 0.14
25
20
2.5
15
100
110
≥ −3
≤ −4
7
4
0.7
30
Max Unit
MHz
MHz
ns
V/μs
ns
dBc
dBc
dBc
nV/√Hz
pA/√Hz
0.8 mV
μV/°C
0.4 mV
μV/°C
4.5 μA
μA
2.01 V/V
+1 %
5 ppm
MΩ
pF
+3.9 V
dB
V
mA
pF
12 V
2.7 mA
26 μA
dB
dB
V
V
10 μA
6 μA
μs
μs
Rev. A | Page 5 of 24
5 Page 
0.12
0.08
0.04
www.datasheet4u.com
0
VS = +3V
VOUT = 200mV p-p
VS = +5V OR VS = ±5V
–0.04
–0.08
–0.12
50ns/DIV
Figure 23. Small Signal Transient Response for Various Supplies
8
VO, dm
6
4
2
0
–2
–4
–6
–8
2.4
VVSO,=dm±5=V12V p-p
1.8
1.2
ERROR = 2 × VIN – VO, dm
0.6
0
2 × VIN
–0.6
–1.2
1µs/DIV
–1.8
–2.4
Figure 24. Settling Time (0.005%), VS = ±5 V
12
INPUT × 2
10
8
OUTPUT
6
4
2
0
–2
–4
–6
–8
–10 1µs/DIV
–12
Figure 25. Input Overdrive Recovery, VS = ±5 V
ADA4941-1
8
6 VVSO,=dm±5=V12V p-p
4 VVSO,=dm±2=.56VV p-p
2
0 VVSO,=dm±1=.52VV p-p
–2
–4
–6
200ns/DIV
–8
Figure 26. Large Signal Transient Response for Various Supplies
9 1.2
8 0.9
7
VVSO,=dm+5=V6V p-p
0.6
6 ERROR = 2 × VIN – VO, dm
5
4 VO, dm
2 × VIN
3
0.3
0
–0.3
–0.6
2 –0.9
1µs/DIV
1 –1.2
Figure 27. Settling Time (0.005%), VS = +5 V
8
6 INPUT × 2
4
OUTPUT
2
0
–2
–4
–6
1µs/DIV
–8
Figure 28. Input Overdrive Recovery, VS = +5 V
Rev. A | Page 11 of 24
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet ADA4941-1.PDF ] | |
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