AD7944
PRODUCTION14-Bit, 2.5 MSPS, PulSAR 15.5 mW ADC in LFCSP
Part Details
- 14-bit resolution with no missing codes
- Throughput: 2.5 MSPS (TURBO high), 2.0 MSPS (TURBO low)
- Low power dissipation
15.5 mW at 2.5 MSPS, with external reference
28 mW at 2.5 MSPS, with internal reference - SNR
84 dB, with on-chip reference
84.5 dB, with external reference - 4.096 V internal reference: typical drift of
±10 ppm/°C
- INL: ±0.25 LSB typical, ±1.0 LSB maximum
- Pseudo differential analog input voltage range
0 V to VREF with VREF up to 5.0 V Allows use of any input range - No pipeline delay
- Logic interface: 1.8 V/2.5 V/2.7 V
- Serial interface: SPI-/QSPI-/MICROWIRE-/DSP-compatible
- Ability to daisy-chain multiple ADCs with busy indicator
- 20-lead, 4 mm × 4 mm LFCSP (QFN)
The AD7944 is a 14-bit, 2.5 MSPS successive approximation analog-to-digital converter (SAR ADC). It contains a low power, high speed, 14-bit sampling ADC, an internal conversion clock, an internal reference (and buffer), error correction circuits, and a versatile serial interface port. On the rising edge of CNV, the AD7944 samples an analog input, IN+, between 0 V and VREF with respect to a ground sense, IN−. The AD7944 features a very high sampling rate turbo mode (TURBO high) and a reduced power normal mode (TURBO low) for low power applications where the power is scaled with the throughput.
In normal mode (TURBO low), the SPI-compatible serial interface also features the ability, using the SDI input, to daisy-chain several ADCs on a single 3-wire bus and provide an optional busy indicator. The serial interface is compatible with 1.8 V, 2.5 V, and 2.7 V supplies using the separate VIO supply.
The AD7944 is available in a 20-lead LFCSP with operation specified from −40°C to +85°C.
APPLICATIONS
- Battery-powered equipment
- Communications
- ATE
- Data acquisition systems
- Medical instruments
Software Resources
Device Drivers 4
Evaluation Software 0
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Hardware Ecosystem
| Parts | Product Life Cycle | Description |
|---|---|---|
| Differential Amplifiers 2 | ||
| ADA4941-1 | PRODUCTION | Single-Supply, Differential 18-Bit ADC Driver |
| AD8475 | PRODUCTION | Precision, Selectable Gain, Fully Differential Funnel Amplifier |
| Operational Amplifiers (Op Amps) 8 | ||
| ADA4897-1 | RECOMMENDED FOR NEW DESIGNS | 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers |
| ADA4898-1 | PRODUCTION | High Voltage, Low Noise, Low Distortion, Unity Gain Stable, High Speed Op Amp |
| ADA4899-1 | PRODUCTION | Unity-Gain Stable, Ultralow Distortion, 1 nV/√Hz Voltage Noise, High Speed Op Amp |
| AD8021 | PRODUCTION | Low Noise, High Speed Amplifier for 16-Bit Systems |
| AD8031 | PRODUCTION | 2.7 V, 800 µA, 80 MHz Rail-to-Rail I/O Single Amplifier |
| AD8605 | PRODUCTION | Precision, Low Noise, CMOS, RRIO Op Amp (single) |
| ADA4841-1 | PRODUCTION | Low Power, Low Noise and Distortion, Rail-to-Rail Output Amplifier |
| AD8655 | PRODUCTION | Low Noise, Precision CMOS Amplifier |
| Voltage References 2 | ||
| ADR433 | PRODUCTION | Ultralow Noise XFET® 3.0V Voltage Reference w/Current Sink and Source Capability |
| ADR445 | PRODUCTION | Ultralow Noise, LDO XFET® 5.0V Voltage Reference w/Current Sink and Source |
Tools & Simulations
Precision ADC Driver Tool
The Precision ADC Driver Tool is a web application that simulates the performance of precision ADC and driver combinations. Potential issues with driver selection, kickback settling, and distortion are flagged, and design tradeoffs can be quickly evaluated. Simulations and calculations include system noise, distortion, and settling of the ADC input
Open ToolIBIS Model 1
Evaluation Kits
AD7944 Evaluation Board