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 Pinout
Specifications
| Gain Control |
Analog |
| -3 dB BW (MHz) |
120MHz |
| Gain Low End (dB) |
-4.5dB |
| Gain High End (dB) |
+43.5dB |
| Number of Channels |
2 |
| Spectral Noise (nV/rtHz) |
0.74nV/rtHz |
| Supply Voltage (V) |
+5V |
| Supply Current |
58mA |
| Gain Accuracy (dB) |
+0.5dB |
|
Parameter |
Rating |
|
Voltage |
Supply Voltage (VPS1, VPS2, VPSV) |
5.5 V |
|
Input Voltage (INH1, INH2) |
VS + 200 mV |
|
ENB, ENBL, ENBV, HILO Voltage |
VS+ 200 mV |
|
GAIN Voltage |
2.5 V |
|
Power Dissipation |
AR Package1
|
0.96 W |
|
AC Package |
1.97 W |
|
Temperature |
Operating Temperature |
40°C to +85°C |
|
Storage Temperature |
65°C to +150°C |
|
Lead Temperature (Soldering 60 sec) |
300°C |
|
JA |
AR Package1
|
68°C/W |
|
AC Package2
|
33°C/W |
DescriptionThe AD8332 is an ultralow noise, dual channel linear-in-dB variable gain amplifier (VGA). Although optimized for ultrasound systems, it may be used for a low noise variable gain control in any application of frequencies up to 120 MHz.
Each channel of the AD8332 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 the AD8332 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 signal paths lead to superb second and third order distortion performance and low crosstalk.
AD8332 Data Sheet
