ADS7x51 12-Bit, 2-MSPS and 14-Bit, 1.5-MSPS, Dual, Differential Input, Simultaneous-Sampling, Analog-to-Digital Converters with Internal Reference
1 Features
- 12- and 14-Bit Pin-Compatible Family
- Simultaneous Sampling of Two Channels
- Supports Fully-Differential Analog Inputs
- Independent Internal Reference (per ADC)
- High Speed:
- Up to 2 MSPS with the ADS7251 (12-Bit)
- Up to 1.5 MSPS with the ADS7851 (14-Bit)
- Excellent Performance:
- ADS7251:
- SNR: 73 dB
- INL: ±1 LSB
- ADS7851:
- SNR: 83.5 dB
- INL: ±2 LSB
- Fully-Specified Over the Extended Industrial Temperature Range: –40°C to +125°C
- Small Footprint: WQFN-16 (3 mm × 3 mm)
2 Applications
- Motor Control: Direct Interface to SinCos Encoders
- Optical Networking: EDFA Gain Control Loop
- Protection Relays
- Power Quality Measurement
- Three-Phase Power Controls
- Programmable Logic Controllers
- Industrial Automation
3 Description
The ADS7251 and ADS7851 belong to a family of pin-compatible, dual, high-speed, simultaneous-sampling, analog-to-digital converters (ADCs) that support fully-differential analog inputs and feature two independent internal voltage references. The ADS7251 offers 12-bit resolution and up to 2-MSPS sampling speed. The ADS7851 offers 14-bit resolution and up to 1.5-MSPS sampling speed.
The devices support a wide digital supply voltage range, allowing easy communication with a variety of digital host controllers using a simple, serial interface. Both devices are fully specified over the extended industrial temperature range (–40°C to +125°C) and are available in a pin-compatible, space-saving, WQFN-16 (3-mm × 3-mm) package.
Device Information
| ORDER NUMBER | PACKAGE | BODY SIZE |
|---|---|---|
| ADS7251RTE | WQFN (16) | 3 mm × 3 mm |
| ADS7851RTE | WQFN (16) | 3 mm × 3 mm |
Typical Application Diagram
4 Revision History
Changes from * Revision (January 2014) to A Revision
- Changed format to meet latest data sheet standards; added Layout section, moved existing sectionsGo
- Deleted Ordering Information tableGo
- Changed Supply Current, IDVDD parameter typical specification in Electrical Characteristics: ADS7251 tableGo
- Changed Supply Current, IDVDD parameter typical specification in Electrical Characteristics: ADS7851 tableGo
- Changed Input Voltage column in Table 1Go
- Added Layout section Go
5 Terminal Configuration and Functions
Terminal Descriptions
| TERMINAL | I/O | DESCRIPTION | |
|---|---|---|---|
| NAME | NO. | ||
| AINM-A | 16 | Analog input | Negative analog input, channel A |
| AINP-A | 15 | Analog input | Positive analog input, channel A |
| AINM-B | 5 | Analog input | Negative analog input, channel B |
| AINP-B | 6 | Analog input | Positive analog input, channel B |
| AVDD | 14 | Supply | ADC supply voltage |
| CS | 9 | Digital input | Chip-select signal; active low |
| DVDD | 7 | Supply | Digital I/O supply |
| GND | 8, 13 | Supply | Digital ground |
| REFGND-A | 2 | Supply | Reference ground potential, channel A |
| REFGND-B | 3 | Supply | Reference ground potential, channel B |
| REFOUT-A | 1 | Analog output | Reference voltage output, REF_A |
| REFOUT-B | 4 | Analog output | Reference voltage output, REF_B |
| SCLK | 10 | Digital input | Serial communication clock |
| SDO-A | 11 | Digital output | Data output for serial communication, channel A |
| SDO-B | 12 | Digital output | Data output for serial communication, channel B |
| Thermal pad | Supply | Exposed thermal pad. TI recommends connecting this pin to the printed circuit board (PCB) ground. |
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