AD7985 16-Bit, 2.5 MSPS PulSAR 11 mW ADC in QFN
The AD7985 is a 16-bit, 2.5 MSPS successive approximation
analog-to-digital converter (SAR ADC). It contains a low power,
high speed, 16-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
AD7985 samples an analog input, IN+, between 0 V and REF
with respect to a ground sense, IN−. The AD7985 features a
very high sampling rate turbo mode (TURBO is high) and a
reduced power normal mode (TURBO is low) for low power
applications where the power is scaled with the throughput.
In normal mode (TURBO is 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. It is compatible with 1.8 V, 2.5 V, and 2.7 V supplies
using the separate VIO supply.
The AD7985 is available in a 20-lead LFCSP with operation
specified from −40°C to +85°C.
Applications
Features and Benefits16-bit resolution with no missing codesThroughput: 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
15.5 mW at 2.5 MSPS, with external reference28 mW at 2.5 MSPS, with internal referenceINL: ±0.7 LSB typical, ±1.5 LSB maximumSNR- 88.5 dB, with on-chip reference
- 90 dB, with external reference
88.5 dB, with on-chip reference90 dB, with external reference4.096 V internal reference: typical drift of ±10 ppm/°CPseudo differential analog input voltage range- 0 V to VREF with VREF up to 5.0 V
- Allows use of any input range
0 V to VREF with VREF up to 5.0 VAllows use of any input rangeSee data sheet for additional features | Reference Designs |
Data Sheets
Application Notes
User Guides
Technical Books
Order Information
| Part Number | Package | Packing Qty | Temp Range | Price 100-499 | Price 1000+ | RoHS |
|---|
| AD7985BCPZ Production | 20 ld LFCSP (4x4mm 2.5EP) | OTH 490 | -40 to 85C | 18.35 | 15.55 | Y |
| AD7985BCPZ-RL7 Production | 20 ld LFCSP (4x4mm 2.5EP) | REEL 1500 | -40 to 85C | 0 | 15.55 | Y |
Evaluation Boards
| Part Number | Description | Price | RoHS |
|---|
| EVAL-AD7985FMCZ | Evaluation Board | 99 | Y |
| EVAL-SDP-CH1Z | Controller Board | 199 | Y |
Reference Materials
