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Texas Instruments ADS7817E/2K5G4
- Part No.:
- ADS7817E/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
ADS7817E/2K5G4.pdf
- Description:
- IC ADC 12BIT SAR 8VSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,282
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Product details
Overview
ADS7817E/2K5G4 from Texas Instruments is a 12-bit, 200kHz SAR analog-to-digital converter with fully differential high-impedance inputs, 2.3mW active power at full rate, 3µA max power-down current, and configurable 100mV–2.5V reference voltage enabling input-referred resolution from 49µV to 1.22mV. It targets transducer interface in battery-powered remote data acquisition systems.
For engineers reviewing the ADS7817E/2K5G4 datasheet, ADS7817E/2K5G4 pinout, ADS7817E/2K5G4 application, or ADS7817E/2K5G4 equivalent, key selection considerations include its MSOP-8 package, bipolar differential input architecture, serial CMOS interface timing, and trade-offs between reference voltage scaling and noise/linearity performance.
Technical Context
The ADS7817E/2K5G4 implements a capacitive redistribution successive approximation register (SAR) architecture on 0.6µm CMOS, integrating sample-and-hold functionality. It requires an external clock (10kHz–3.2MHz), external reference (100mV–2.5V), and single +5V supply, with conversion initiated by CS/SHDN falling edge and serial output synchronized to DCLOCK falling edges.
Its analog input accepts true differential or single-ended signals with ±VREF full-scale span, common-mode rejection of 80dB, and power supply rejection of 82dB. Input leakage is ±1µA, input capacitance is 15pF, and acquisition time is 1.5 clock cycles - all specified over –40°C to +85°C with VCC = 4.75–5.25V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR with no missing codes guaranteed; delivers 12 distinct digital output levels across full scale. |
| Sampling Rate | 200kHz maximum throughput; defines real-time signal capture capability for dynamic sensor inputs. |
| Power Consumption | 2.3mW at 200kHz (460µA quiescent); enables multi-hour operation in coin-cell–powered systems. |
| Power-Down Current | 3µA maximum; reduces standby power by >99% versus active mode for duty-cycled sensing. |
| Reference Range | 100mV–2.5V externally supplied; sets LSB size from 49µV to 1.22mV and directly scales input full-scale range. |
| Differential Linearity | ±2 LSB max (E-grade); ensures monotonicity and predictable code transitions across temperature. |
| Integral Linearity | ±2 LSB max (E-grade); limits end-point error to ≤0.05% of full scale for precision measurement. |
| Common-Mode Rejection | 80dB minimum; suppresses noise coupled equally to +In and –In, critical for noisy industrial environments. |
Pinout & Package
ADS7817E/2K5G4 is housed in an MSOP-8 package (3.0mm × 4.9mm, 0.65mm pitch), optimized for space-constrained portable instrumentation and isolated sensor nodes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | External reference voltage input | Sets full-scale analog input range; impedance >5GΩ when CS = VCC; draws up to 25µA at 200kHz and full-scale output. |
| +In (Pin 2) | Non-inverting analog input | Accepts voltage from 0.1V below GND to VCC+0.3V; forms differential pair with –In; 15pF input capacitance. |
| –In (Pin 3) | Inverting analog input | Accepts voltage from 0.1V below GND to 4V; matched impedance required with +In to avoid gain/offset drift. |
| GND (Pin 4) | Analog ground reference | Must connect to clean analog ground plane; isolation from digital ground prevents noise coupling into conversion. |
| CS/SHDN (Pin 5) | Chip select / shutdown control | Active-low conversion trigger; HIGH forces full power-down (3µA); LOW enables serial output after second DCLOCK edge. |
| DOUT (Pin 6) | Serial data output | Outputs 12-bit two's complement MSB-first on falling DCLOCK; tri-states after LSB unless extended clocking applied. |
| DCLOCK (Pin 7) | Serial interface clock input | Synchronizes data transfer; minimum pulse width 150ns; frequency determines conversion speed (fCLK = 16×fSAMPLE). |
| +VCC (Pin 8) | Positive power supply | Operates from 4.75V–5.25V; supplies analog and digital sections; requires local 0.1µF ceramic bypass capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| True differential input | Enables rejection of common-mode noise in transducer bridges and isolated amplifiers without external instrumentation amps. |
| Micro-power operation | 2.3mW at 200kHz allows integration into energy-harvesting or long-life battery systems without thermal derating. |
| Configurable reference range | 100mV–2.5V support permits optimization of dynamic range vs. noise floor for specific sensor output amplitudes. |
| Automatic power-down | Enters 3µA sleep state automatically after conversion completion or when CS is HIGH, minimizing idle current. |
| Serial CMOS interface | 3-wire synchronous protocol eliminates parallel bus routing; compatible with low-pin-count microcontrollers and FPGAs. |
| Bipolar input range | Accepts ±VREF signals directly, supporting AC-coupled sensors and differential outputs without level-shifting circuitry. |
Applications
| Transducer Interface | Battery-Powered Data Loggers |
|---|---|
Use Scenario: Direct digitization of strain gauge, thermocouple, or pressure sensor outputs in handheld field instruments. IC Role / Device Role / Timing Role: ADC front-end with integrated sample-and-hold; acquires differential bridge signals at up to 200kHz with minimal external components. Use Value: Eliminates need for external op-amp signal conditioning due to high-impedance differential input and 80dB common-mode rejection. |
Use Scenario: Multi-channel environmental monitoring in solar-charged remote nodes with 10-year battery life targets. IC Role / Device Role / Timing Role: Low-power sampling ADC that enters 3µA shutdown between readings; supports burst-mode acquisition triggered by wake-up interrupts. Use Value: Reduces average system power by >95% versus always-on ADCs, extending operational lifetime without sacrificing resolution. |
| Isolated Data Acquisition | AC Motor Control Feedback |
Use Scenario: Digitizing current/voltage feedback across opto-isolators or digital isolators in industrial PLC I/O modules. IC Role / Device Role / Timing Role: Isolation-side ADC accepting differential inputs from isolated amplifiers; referenced to floating ground with 15pF input capacitance. Use Value: Maintains 12-bit linearity despite galvanic separation, avoiding error accumulation from multiple gain stages. |
Use Scenario: Real-time phase current sampling in three-phase inverter drives operating at 10–20kHz PWM frequencies. IC Role / Device Role / Timing Role: High-speed ADC capturing motor current zero-crossings and distortion harmonics; synchronized to PWM timer via CS/SHDN. Use Value: Enables precise field-oriented control (FOC) with <1µs timing jitter, critical for torque ripple reduction and efficiency optimization. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7816E/2K5 | 10-bit resolution, 200kHz sampling, same MSOP-8 package and pinout; lower power (1.5mW), reduced ENOB at low reference voltages. | Lower cost for applications requiring ≤10-bit accuracy; insufficient for high-precision transducer metrology. | Select ADS7817E/2K5 when 12-bit monotonicity and ±2 LSB INL are mandatory; choose ADS7816E/2K5 for cost-sensitive, lower-resolution sensing. |
| ADS8325IBDR | 16-bit SAR, 100kSPS, SPI interface, 3.3V supply; higher resolution but slower, larger QFN-10 package, no bipolar input support. | Targeted at precision lab equipment; lacks differential input common-mode rejection and 5V compatibility. | ADS7817E/2K5 remains preferred for 5V battery systems needing differential noise immunity; ADS8325IBDR suits high-accuracy, low-speed benchtop use. |
Compared with ADS7816E/2K5 and ADS8325IBDR, the ADS7817E/2K5 uniquely balances 12-bit precision, 200kHz throughput, 5V operation, true differential input, and ultra-low power in a compact MSOP-8 - making it optimal for portable industrial sensors where size, power, and noise immunity are co-constrained.
Availability
ADS7817E/2K5G4 is available at Aetrix Electronics and suitable for transducer interface, battery-powered data loggers, isolated data acquisition, and AC motor control applications requiring stable component supply across extended production lifecycles.
Supply support for ADS7817E/2K5G4 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision data converters and low-power design.
The ADS7817E/2K5G4 belongs to TI's precision SAR ADC product line, engineered specifically for high-fidelity, low-power signal digitization in portable and isolated measurement systems.
FAQ
What is the absolute maximum input voltage range for ADS7817E/2K5G4?
The ADS7817E/2K5G4 specifies absolute maximum analog input voltage as –0.3V to (+VCC + 0.3V) on +In and –0.3V to 4V on –In. Exceeding these ranges risks permanent damage or degraded linearity. For reliable operation at VCC = 5V, keep +In within –0.3V to +5.3V and –In within –0.3V to +4.0V. These limits are defined in the Absolute Maximum Ratings table of the SBAS066A datasheet.
Does ADS7817E/2K5G4 support true differential input mode?
Yes, the ADS7817E/2K5G4 supports true differential input mode where the full-scale span equals (+In – –In), enabling rejection of common-mode noise. In this mode, each input swings ±VREF about a shared common voltage, and the device achieves 80dB common-mode rejection. This is confirmed in the "Analog Input" section and Figure 3 of the SBAS066A datasheet.
What is the minimum clock frequency required for ADS7817E/2K5G4 operation?
The ADS7817E/2K5G4 requires a minimum DCLOCK frequency of 10kHz to maintain capacitor charge integrity during sampling. At this rate, throughput drops to 625Hz. The clock duty cycle is flexible as long as high/low times exceed 150ns. This specification is documented in the "Theory of Operation" and "Timing Characteristics" sections of SBAS066A.
How does reference voltage affect noise performance in ADS7817E/2K5G4?
Lowering the reference voltage increases quantization noise relative to LSB size: at 100mV reference, internal noise contributes ~13 LSB peak-to-peak versus 0.52 LSB at 2.5V. This is due to fixed internal noise amplitude being expressed in smaller voltage units. The "Effective Number of Bits vs Reference Voltage" curve in SBAS066A confirms ENOB degradation below 1V reference.
Can ADS7817E/2K5G4 be used with a 3.3V supply?
No - the ADS7817E/2K5G4 is specified only for VCC = 4.75V to 5.25V. Its logic thresholds (VIH ≥ 3.0V, VIL ≤ 0.8V), internal biasing, and reference input behavior assume 5V operation. Using 3.3V violates the Absolute Maximum Ratings and will cause functional failure or parametric noncompliance per SBAS066A Section 6.
ADS7817E/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 200k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-VSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7817E/2K5G4 FAQ
1.How can I place an order for ADS7817E/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7817E/2K5G4 on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ADS7817E/2K5G4 reliable?
The price and inventory of ADS7817E/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7817E/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS7817E/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7817E/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7817E/2K5G4?
ADS7817E/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7817E/2K5G4 order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ADS7817E/2K5G4?
For technical support, including ADS7817E/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7817E/2K5G4 requirements.
6.How does Aetrix verify that ADS7817E/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS7817E/2K5G4 products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ADS7817E/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS7817E/2K5G4?
All ADS7817E/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS7817E/2K5G4, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ADS7817E/2K5G4 part is unused and in its original packaging.
Return procedure for ADS7817E/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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