AD7761BSTZ - ADI

The pictures are for reference only, and the specific specifications can be found in the product manual.

Part No

AD7761BSTZ
Manufacturer

ADI
ChipWorker Part#

CW2940992
Category

Analog to Digital, ADC IC
Package

LQFP-64
Description

ANALOG DEVICES AD7761BSTZ Analog to Digital Converter, 8CH, Sigma-Delta, 16Bit, 256KSPS, Single, 2V, 5.5V, LQFP
Documentation

Datasheet

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AD7761BSTZ Specifications

Attribute	Attribute Value

Part Number	AD7761BSTZ
Manufacturer	ADI
ChipWorker Part#	CW2940992
Category	Analog to Digital, ADC IC
Documentation	Datasheet
Mounting Style	Surface Mount
Number of Pins	64 Pin
Case/Package	LQFP-64
Supply Voltage (DC)	2.00V (min)
Number of Positions	64 Position
Number of Bits	16 Bit
Power Dissipation	631 mW
Sample Rate	256 ksps
Number of ADCs	8 ADC
Number of Inputs	8 Input
Operating Temperature (Max)	105 ℃
Operating Temperature (Min)	-40 ℃
Power Dissipation (Max)	681 mW
Number of Input Channels	8 Channel
Supply Voltage (Max)	5.5 V
Supply Voltage (Min)	2 V
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Operating Temperature	-40℃ ~ 105℃
Product Lifecycle Status	Active
Packaging	Each
RoHS	RoHS Compliant
Lead-Free Status	Lead Free
REACH SVHC Compliance Edition	2016/06/20
ECCN Code	EAR99

Product Description

Product Details
The AD7761 is an 8-channel, simultaneous sampling sigma-delta (Σ-Δ) analog-to-digital converter (ADC) with a Σ-Δ modulator and digital filter per channel, enabling synchronized sampling of ac and dc signals.
The AD7761 achieves 97.7 dB dynamic range at a maximum input bandwidth of 110.8 kHz, combined with typical performance of ±1 LSB integral nonlinearity (INL), ±1 LSB offset error, and ±5 LSB gain error.
The AD7761 user can trade off input bandwidth, output data rate, and power dissipation. Select one of three power modes to optimize the device for noise targets and power consumption. The flexibility of the AD7761 allows it to become a reusable platform for low power dc and high performance ac measurement modules.
The AD7761 has three modes: fast mode (256 kSPS maximum, 110.8 kHz input bandwidth, 51.5 mW per channel), median mode (128 kSPS maximum, 55.4 kHz input bandwidth, 27.5 mW per channel) and low power mode (32 kSPS maximum, 13.8 kHz input bandwidth, 9.375 mW per channel).
The AD7761 offers extensive digital filtering capabilities, such as a wideband, low ±0.005 dB pass-band ripple, antialiasing low-pass filter with sharp roll-off, and 105 dB attenuation at the Nyquist frequency.
Frequency domain measurements can use the wideband linear phase filter. This filter has a flat pass band (±0.005 dB ripple) from dc to 102.4 kHz at 256 kSPS, from dc to 51.2 kHz at 128 kSPS, or from dc to 12.8 kHz at 32 kSPS.
The AD7761 also offers sinc response via a sinc5 filter, a low latency path for low bandwidth, and low noise measurements.
The wideband and sinc5 filters can be selected and run on a per channel basis.
Within these filter options, the user can improve the dynamic range by selecting from decimation rates of ×32, ×64, ×128, ×256, ×512, and ×1024. The ability to vary the decimation filtering optimizes noise performance to the required input bandwidth.
Embedded analog functionality on each ADC channel makes design easier, such as a precharge buffer on each analog input that reduces analog input current and a precharge reference buffer per channel reduces input current and glitches on the reference input terminals.
The device operates with a 5 V AVDD1A and AVDD1B supply, a 2.25 V to 5.0 V AVDD2A and AVDD2B supply, and a 2.5 V to 3.3 V or 1.8 V IOVDD supply (see the 1.8 V IOVDD Operation section for specific requirements for operating at 1.8 V IOVDD).
The device requires an external reference; the absolute input reference voltage range is 1 V to AVDD1 − AVSS.
For the purposes of clarity within this data sheet, the AVDD1A and AVDD1B supplies are referred to as AVDD1 and the AVDD2A and AVDD2B supplies are referred to as AVDD2. For the negative supplies, AVSS refers to the AVSS1A, AVSS1B, AVSS2A, AVSS2B, and AVSS pins.
The specified operating temperature range is −40°C to +105°C. The device is housed in a 10 mm × 10 mm 64-lead LQFP package with a 12 mm × 12 mm printed circuit board (PCB) footprint.
Throughout this data sheet, multifunction pins, such as XTAL2/MCLK, are referred to either by the entire pin name or by a single function of the pin, for example MCLK, when only that function is relevant.
**Applications**
Data acquisition systems: USB/PXI/Ethernet
Instrumentation and industrial control loops
Audio testing and measurement
Vibration and asset condition monitoring
3-phase power quality analysis
Sonar
High precision medical electroencephalogram (EEG)/ electromyography (EMG)/electrocardiogram (ECG)
### Features and Benefits
Precision ac and dc performance
8-channel simultaneous sampling
256 kSPS ADC ODR per channel
97.7 dB dynamic range
110.8 kHz input bandwidth (−3 dB BW)
−120 dB THD, typical
±1 LSB INL, ±1 LSB offset error, ±5 LSB gain error
Optimized power dissipation vs. noise vs. input bandwidth
Selectable power, speed, and input bandwidth
Fast (highest speed): 110.8 kHz BW, 51.5 mW per channel
Median (half speed): 55.4 kHz BW, 27.5 mW per channel
Low power (lowest power): 13.8 kHz BW, 9.375 mW per channel
Input BW range: dc to 110.8 kHz
Programmable input bandwidth/sampling rates
CRC error checking on data interface
Daisy-chaining
Linear phase digital filter
Low latency sinc5 filter
Wideband brick wall filter: ±0.005 dB ripple to 102.4 kHz
Analog input precharge buffers
Power supply
AVDD1 = 5 V, AVDD2 = 2.25 V to 5.0 V
IOVDD = 2.5 V to 3.3 V or IOVDD = 1.8 V
64-lead LQFP package, no exposed pad
Temperature range: −40°C to +105°C

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