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.