AD8331ARQZ-R7
Amplifiers & Comparators
Technical Specifications
| Type | Description |
|---|---|
| Quiescent Current | 25 mA |
| Output Current | 105 mA |
| -3dB Bandwidth | 120MHz |
| Amplifier Type | VGA |
| Output Type | Differential |
| Single Supply | 4.5V~5.5V |
| Type | Description |
|---|---|
| Channels | 1 |
| Features | Fully differential;Analog voltage gain;Enable/shutdown function |
| Slew Rate Vus | 300 V/µs |
| Operating Temperature | -40°C~+85°C |
| Package / Case | QSOP-20-150mil |
Product Introduction
The AD8331/AD8332/AD8334 are single-channel/dual-channel/quad-channel, ultralow noise, linear-in-dB variable gain amplifiers (VGAs) optimized for ultrasound systems, usable as low-noise variable gain elements operating at frequencies up to 120 MHz.
Each channel integrates an ultralow noise preamplifier (LNA), an X-AMP VGA with 48 dB gain range, and an optional gain postamplifier with adjustable output limiting. The LNA provides 19 dB gain with single-ended input and differential output. LNA input impedance can be adjusted using a resistor to match the signal source without degrading noise performance.
The 48 dB VGA gain range makes these devices suitable for a wide variety of applications. Bandwidth consistency is maintained excellently across the entire gain range. For control voltages in the 40 mV to 1 V range, the gain control interface provides precise linear-in-dB adjustment of 50 dB/V. Factory trimming ensures excellent gain matching between devices and channels.
The differential signal path delivers superior second- and third-order distortion performance and low crosstalk.
The low output-referred noise of the VGA is advantageous when driving high-speed differential ADCs. Postamplifier gain is pin-selectable at 3.5 dB or 15.5 dB to optimize gain range and output noise for 12-bit or 10-bit converter applications. The output can be limited to a user-selected clamp level to prevent overloading the input of a downstream ADC. An external resistor sets the clamp level.
Operating temperature range is -40°C to +85°C. The AD8331 is available in a 20-lead QSOP package, the AD8332 in 28-lead TSSOP and 32-lead LFCSP packages, and the AD8334 in a 64-lead LFCSP package.
Features
- Ultra-low noise preamplifier
- Voltage noise = 0.74 nV/√Hz
- Current noise = 2.5 pA/√Hz
- Low power consumption
- AD8331: 125 mW per channel
- AD8332, AD8334: 145 mW per channel
- Programmable postamplifier for wide gain range
- LO gain mode: −4.5 dB to +43.5 dB
- HI gain mode: 7.5 dB to 55.5 dB
- Low output-referred noise: 48 nV/√Hz (typical)
- Active input impedance matching
- Optimized for 10-bit/12-bit ADC
- Selectable output clamp level
- 5 V single-supply operation
- AD8332 and AD8334 available in pin-compatible chip-scale package
Applications
- Ultrasonic and sonar time gain control
- High-performance AGC systems
- I/Q signal processing
- High-speed, dual-channel ADC driver
Datasheet
Alternative Parts
Common AD8331ARQZ-R7 alternatives overseas buyers search for:
Compliance & Export Codes
| Type | Details |
|---|---|
| RoHS | ROHS3 |
| ECCN | EAR99 |
| CNHTS | 8542339000 |
| USHTS | 8542330001 |
| TARIC | 8542339000 |
| Type | Details |
|---|---|
| CAHTS | 8542330000 |
| BRHTS | 85423390 |
| INHTS | 85423300 |
| MXHTS | 8542.33.99 |
Sourcing Information
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