Single-Supply, Differential 18-Bit ADC Driver ADA4941-1
FEATURES www.datasheet4u.com
Single-ended-to-differential conver...
Single-Supply, Differential 18-Bit ADC Driver ADA4941-1
FEATURES www.datasheet4u.com
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
DISTORTION (dBc)
FUNCTIONAL BLOCK DIAGRAM
FB
1 8
IN
REF
2
7
DIS
V+
3
6
V–
05704-001
OUT+
4
5
OUT–
Figure 1.
–60 –65 –70 –75 –80 –85 –90 –95 –100 –105 –110 –115 –120 –125 –130 –135 –140 0.1 HD2 1 HD3 10 FREQUENCY (kHz) 100 1000
05704-045
VO = 6V p-p
APPLICATIONS
Single-supply data acquisition systems Instrumentation Process control Battery-power systems Medical instrumentation
VO = 2V p-p HD3 HD2
Figure 2. Distortion vs. Frequency at Various Output Amplitudes
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-todifferential 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, su...
