1 Features

• Small solution size:

– DSBGA and WQFN packages

– Space-saving, capless, 2.5-V internal reference

• 8 channels configurable as any combination of:

– Up to 8 analog inputs, digital inputs, or digital

outputs

• Programmable averaging filters:

– Programmable sample size for averaging

– Averaging with internal conversions

– 20-bit resolution for average output

• Low-leakage multiplexer with channel sequencer:

– Manual mode, on-the-fly mode, and autosequence

mode

• Excellent AC and DC performance:

– SNR: 91.9 dB, THD: –100 dB

– Improved SNR with programmable averaging

filters

– INL: ±1 LSB, 16-bit no missing codes

– Internal calibration improves offset and drift

– 250 kSPS sample rate with no latency

• Wide operating range:

– ADC input range: 0 V to VREF and 2 × VREF

– Analog supply: 3 V to 5.5 V

– Digital supply: 1.65 V to 5.5 V

– Temperature range: –40°C to +125°C

• Enhanced-SPI digital interface:

– High-speed, 60-MHz SPI

2 Applications

• Optical modules

• Optical line cards

• Multiparameter patient monitors

3 Description

The ADS7066 is a small, 16-bit, 8-channel, highprecision

successive-approximation register (SAR)

analog-to-digital converter (ADC). The ADS7066 has

an integrated capless reference and a reference

buffer that helps reduce the overall solution size

by requiring fewer external components. The device

family includes the ADS7067 (800 kSPS) and the

ADS7066 (250 kSPS) speed variants.

The ADS7066 features built-in offset calibration for

improved accuracy over wide operating conditions

of the system. The programmable averaging filters

enable higher resolution measurement. The eight

channels of the ADS7066 can be individually

configured as analog inputs, digital inputs, or digital

outputs that simplify circuit design for mixed signal

feedback and digital control.

The enhanced-SPI enables the ADS7066 in achieving

high throughput at lower clock speeds, thereby

simplifying the board layout and lowering system cost.

The ADS7066 features a cyclic redundancy check

(CRC) for data read and write operations and the

power-up configuration.