AD7715
PRODUCTION3 V/5 V, 450 µA, 16-Bit, Sigma-Delta ADC
- Part Models
- 10
- 1ku List Price
- Starting From $7.97
Part Details
- Charge-balancing ADC
16-bits no missing codes
0.0015% nonlinearity - Programmable gain front end
Gains of 1, 2, 32 and 128
Differential input capability - Three-wire serial interface
- Ability to buffer the analog input
- SPI-, QSPI™-, MICROWIRE™-, and DSP-compatible
- 3 V (AD7715-3) or 5 V (AD7715-5) operation
- Low supply current: 450 μA maximum @ 3 V supplies
- Low-pass filter with programmable output update
- 16-lead SOIC/PDIP/TSSOP
The AD7715 is a complete analog front end for low frequency measurement applications. The part can accept low level input signals directly from a transducer and outputs a serial digital word. It employs a Σ-Δ conversion technique to realize up to 16 bits of no missing codes performance. The input signal is applied to a proprietary programmable gain front end based around an analog modulator. The modulator output is processed by an on-chip digital filter. The first notch of this digital filter can be programmed via the on-chip control register allowing adjustment of the filter cutoff and output update rate.
The AD7715 features a differential analog input as well as a differential reference input. It operates from a single supply (3 V or 5 V). It can handle unipolar input signal ranges of 0 mV to 20 mV, 0 mV to 80 mV, 0 V to 1.25 V and 0 V to 2.5 V. It can also handle bipolar input signal ranges of ±20 mV, ±80 mV, ±1.25 V and ±2.5 V. These bipolar ranges are referenced to the negative input of the differential analog input. The AD7715 thus performs all signal conditioning and conversion for a single channel system.
The AD7715 is ideal for use in smart, microcontroller, or DSP-based systems. It features a serial interface that can be configured for three-wire operation. Gain settings, signal polarity, and update rate selection can be configured in software using the input serial port. The part contains self-calibration and system calibration options to eliminate gain and offset errors on the part itself or in the system.
CMOS construction ensures very low power dissipation, and power-down mode reduces the standby power consumption to 50 μW typical. The part is available in a 16-lead, 0.3 inch-wide, plastic dual-in-line package (PDIP) as well as a 16-lead 0.3 inch wide small outline (SOIC_W) package and a 16-lead TSSOP package.
PRODUCT HIGHLIGHTS
- The AD7715 consumes less than 450 μA in total supply current at 3 V supplies and 1 MHz master clock, making it ideal for use in low-power systems. Standby current is less than 10 μA.
- The programmable gain input allows the AD7715 to accept input signals directly from a strain gage or transducer removing a considerable amount of signal conditioning.
- The AD7715 is ideal for microcontroller or DSP processor applications with a three-wire serial interface reducing the number of interconnect lines and reducing the number of optocouplers required in isolated systems. The part contains on-chip registers which allow software control over output update rate, input gain, signal polarity, and calibration modes.
- The part features excellent static performance specifications with 16-bits no missing codes, ±0.0015% accuracy, and low rms noise (<550 nV). Endpoint errors and the effects of temperature drift are eliminated by on-chip calibration options, which remove zero-scale and full-scale errors.
Documentation
Data Sheet 1
Application Note 8
Technical Articles 4
Frequently Asked Question 1
Analog Dialogue 3
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| AD7715ANZ-3 | 16-Lead PDIP | ||
| AD7715ANZ-5 | 16-Lead PDIP | ||
| AD7715ARUZ-3 | 16-Lead TSSOP | ||
| AD7715ARUZ-3REEL7 | 16-Lead TSSOP | ||
| AD7715ARUZ-5 | 16-Lead TSSOP | ||
| AD7715ARUZ-5REEL7 | 16-Lead TSSOP | ||
| AD7715ARZ-3 | 16-Lead SOIC Wide | ||
| AD7715ARZ-3REEL | 16-Lead SOIC Wide | ||
| AD7715ARZ-5 | 16-Lead SOIC Wide | ||
| AD7715ARZ-5REEL | 16-Lead SOIC Wide |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Mar 29, 2021 - 21_0033 Assembly Site Transfer for 14/16L 300_MIL PDIP to Cirtek |
||
| AD7715ANZ-3 | PRODUCTION | |
| AD7715ANZ-5 | PRODUCTION | |
|
Aug 19, 2009 - 07_0024 Package Material Changes for SOT23, MiniSO, MQFP, PDIP, PLCC, SOIC (narrow and wide body), SSOP, TSSOP and TSSOP exposed pad |
||
| AD7715ANZ-3 | PRODUCTION | |
| AD7715ANZ-5 | PRODUCTION | |
|
Feb 11, 2011 - 10_0005 Halogen Free Material Change for TSSOP Products Assembled at Amkor |
||
| AD7715ARUZ-3 | PRODUCTION | |
| AD7715ARUZ-3REEL7 | PRODUCTION | |
| AD7715ARUZ-5 | PRODUCTION | |
| AD7715ARUZ-5REEL7 | PRODUCTION | |
|
Aug 4, 2010 - 10_0117 Halogen Free Material Change for SOIC_W Products at Carsem |
||
| AD7715ARZ-3 | PRODUCTION | |
| AD7715ARZ-3REEL | PRODUCTION | |
| AD7715ARZ-5 | PRODUCTION | |
| AD7715ARZ-5REEL | PRODUCTION | |
|
Feb 8, 2010 - 04_0080 Qualification of the 8" C6 and Q Wafer Fab Processes at Analog Devices, Limerick, Ireland. |
||
| AD7715ARZ-5 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
AD7715 Code Examples 1
Evaluation Software 0
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Tools & Simulations
Sigma-Delta ADC Tutorial
An interactive illustration showing the behavior of an idealized sigma-delta A/D converter.
Open Tool