Features: Ultralow noise preamplifier
Voltage noise = 0.74 nV/Hz
Current noise = 2.5 pA/Hz
3 dB bandwidth: 120 MHz
Low power: 125 mW/channel
Wide gain range with programmable postamp
4.5 dB to +43.5 dB
+7.5 dB to +55.5 dB
Low output-referred noise: 48 nV/Hz typical
Active input impedance matching
Optimized for 10-/12-bit ADCs
Selectable output clamping level
Single 5 V supply operation
Available in space-saving chip scale package
ApplicationUltrasound and sonar time-gain control
High performance AGC systems
I/Q signal processing
High speed dual ADC driver Pinout
Specifications
| Parameter |
Rating |
Voltage
Supply Voltage (VPSn, VPSV, VPSL, VPOS)
Input Voltage (INHn)
ENB, ENBL, ENBV, HILO Voltage
GAIN Voltage |
5.5 V
VS + 200 mV
VS + 200 mV
2.5 V |
Power Dissipation
RU-28 Package (AD8332)4
CP-32 Package (AD8332)5
RQ-20 Package (AD8331)4
|
0.96 W
1.97 W
0.78 W |
Temperature
Operating Temperature
Storage Temperature
Lead Temperature (Soldering 60 sec) |
40°C to +85°C
65°C to +150°C
300°C |
JA
RU-28 Package (AD8332)4
CP-32 Package (AD8332)5
RQ-20 Package (AD8331)4
|
68°C/W
33°C/W
83°C/W |
JC
RU-28 Package (AD8332)4
CP-32 Package (AD8332)5
RQ-20 Package (AD8331)4
|
14°C/W
33°C/W
n/a |
| Gain Control |
Analog |
| -3 dB BW (MHz) |
120MHz |
| Gain Low End (dB) |
-4.5dB |
| Gain High End (dB) |
+43dB |
| Number of Channels |
1 |
| Spectral Noise (nV/rtHz) |
0.74nV/rtHz |
| Supply Voltage (V) |
+5V |
| Supply Current |
25mA |
| Gain Accuracy (dB) |
+0.5dB |
DescriptionThe AD8331/AD8332 are single- and dual-channel ultralow noise, linear-in-dB, variable gain amplifiers. Although optimized for ultrasound systems, they are usable as low noise variable gain elements at frequencies up to 120 MHz.
Each channel consists of an ultralow noise preamplifier (LNA), an X-AMP® VGA with 48 dB of gain range, and a selectable gain postamplifier with adjustable output limiting. The LNA gain is
19 dB with a single-ended input and differential outputs capable of accurate, programmable active input impedance matching by selecting an external feedback resistor. Active impedance
control optimizes noise performance for applications that benefit from input matching.
The 48 dB gain range of the VGA makes these devices suitable for a variety of applications. Excellent bandwidth uniformity is maintained across the entire range. The gain control interface
provides precise linear-in-dB scaling of 50 dB/V for control voltages between 40 mV and 1 V. Factory trim ensures excellent part-to-part and channel-to-channel gain matching. Differential
gnal paths lead to superb second and third order distortion performance and low crosstalk.
AD8331 Data Sheet
