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Texas Instruments ADS7800JU
- Part No.:
- ADS7800JU
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
ADS7800JU.pdf
- Description:
- IC ADC 12BIT SAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,553
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Product details
Overview
ADS7800JU from Texas Instruments is a 12-bit successive-approximation analog-to-digital converter (SAR ADC) with integrated sample/hold, internal ±2V reference, and three-state parallel output drivers. It delivers 333 kSPS throughput, ±10V/±5V bipolar input ranges, and guaranteed 3 µs total acquisition + conversion time over –40°C to +85°C. Used in precision data acquisition systems requiring high linearity and low distortion.
For engineers reviewing the ADS7800JU datasheet, ADS7800JU pinout, ADS7800JU application, or ADS7800JU equivalent, this page provides verified technical context, real-world timing behavior, DC/AC performance limits, SOIC-24 package interface details, and validated alternative options for industrial instrumentation and test equipment design.
Technical Context
The ADS7800JU implements a charge-redistribution SAR architecture with laser-trimmed thin-film scaling resistors enabling precise ±10V and ±5V input range selection via pin-strapping (IN1/IN2). Its internal clock is factory trimmed to 2.70 µs max conversion time, with aperture jitter of 150 ps rms and 13 ns aperture delay - critical for high-fidelity signal capture.
It features dual isolated +5V supplies (VSA/VSD), separate AGND/DGND pins, and TTL/CMOS-compatible control logic (R/C, CS, HBE) supporting both Convert Mode (negative-edge triggered) and Read Mode (positive-edge read + negative-edge convert). Internal reference output (REF) provides 2.0 V ±0.1 V with 10 µA sourcing capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4.88 mV LSB step size on ±10V range, enabling sub-millivolt measurement resolution. |
| Throughput Rate | 333 kHz - supports real-time sampling of signals up to ~160 kHz (Nyquist-limited), suitable for motor control feedback loops. |
| Integral Linearity Error | ±0.5 LSB - ensures monotonicity and <0.012% full-scale error across temperature, critical for calibration-critical instrumentation. |
| Signal-to-Noise Ratio | 72 dB - corresponds to ~11.9 effective bits (ENOB) at 47 kHz input, confirming high dynamic fidelity in noisy environments. |
| Spurious-Free Dynamic Range | 80 dB - suppresses harmonics and intermodulation products, essential for spectral analysis and communications test equipment. |
| Power Dissipation | 215 mW max - operates from +5V and –15V supplies, requiring thermal management only in high-density PCB layouts. |
| Operating Temperature | –40°C to +85°C - qualified for industrial automation and embedded data loggers without derating. |
Pinout & Package
ADS7800JU is packaged in a 24-pin SOIC (DW) with 300 mil width, RoHS-compliant, moisture sensitivity level 3 (260°C peak reflow, 168-hour floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN1) | ±10V Analog Input | Connect signal source here for ±10V range; pin 2 must be grounded to select this mode. |
| 2 (IN2) | ±5V Analog Input | Connect signal source here for ±5V range; pin 1 must be grounded to select this mode. |
| 3 (REF) | +2V Reference Output | Bypass with 22–47 µF tantalum capacitor; not intended for direct external load driving beyond 10 µA. |
| 4 (AGND) | Analog Ground | Must be connected directly to pin 13 (DGND) externally; forms dedicated analog return path. |
| 5–17 (D11–D0) | Parallel Data Outputs | 12-bit offset binary format; outputs enter Hi-Z state during BUSY LOW; HBE controls 12-bit vs. 8-bit/4-bit readout. |
| 18 (HBE) | High Byte Enable | LOW = 12-bit parallel output on D11–D0; HIGH = MSB nibble on D14–D17, LSB nibble on D9–D12 (forced LOW). |
| 19 (R/C) | Read/Convert Control | Falling edge initiates conversion when CS=LOW and BUSY=HIGH; rising edge enables data read in Read Mode. |
| 20 (CS) | Chip Select | LOW enables device operation; HIGH forces all outputs into Hi-Z state, isolating bus during idle periods. |
| 21 (BUSY) | Conversion Status | LOW during acquisition + conversion; rising edge indicates data validity and completion of 3 µs cycle. |
| 22 (–VS) | Negative Supply | Accepts –12V or –15V; bypass with 1 µF tantalum close to pin; absolute max –16.5V. |
| 23 (VSD) | Digital +5V Supply | Must be tied to pin 24 (VSA); bypass with 6.8 µF + 0.1 µF near package; digital supply domain. |
| 24 (VSA) | Analog +5V Supply | Must be tied to pin 23 (VSD); bypass identically; analog supply domain with separate internal routing. |
Key Features
| Feature | Design Value |
|---|---|
| Internal Sample/Hold + Clock + Reference | Eliminates need for external components in basic configurations, reducing BOM count and layout complexity for standalone DAQ modules. |
| ±10V / ±5V Input Range Selection | Hardware-configurable via IN1/IN2 grounding - no software register writes or external gain switches required. |
| No Missing Codes Over Temperature | Guaranteed monotonicity across –40°C to +85°C ensures reliable zero-crossing detection and control loop stability. |
| Three-State Parallel Output Drivers | Enables direct connection to shared microprocessor data buses without external transceivers or bus contention logic. |
| Separate Analog/Digital Supplies & Grounds | VSA/VSD and AGND/DGND isolation minimizes digital switching noise coupling into analog front-end, preserving SNR. |
Applications
| Industrial Process Monitoring | Automated Test Equipment (ATE) |
|---|---|
|
Use Scenario: Continuous voltage/current monitoring of PLC I/O modules and sensor transmitters in factory-floor environments with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary 12-bit digitizer capturing analog sensor outputs at 333 kSPS with deterministic 3 µs latency, synchronized to system clock via R/C edge. Use Value: ±0.5 LSB integral linearity ensures calibrated accuracy over full industrial temperature range without field recalibration. |
Use Scenario: High-speed stimulus-response testing of op amps and filters using swept-frequency sine wave inputs. IC Role / Device Role / Timing Role: Digitizer in signal analyzer subsystem, acquiring post-DUT output with 72 dB SNR and 80 dB SFDR for spectral purity validation. Use Value: Internal 2.0 V reference and laser-trimmed resistors maintain consistent full-scale definition across production units and temperature. |
| Motor Drive Current Feedback | Medical Instrumentation Signal Chain |
|
Use Scenario: Real-time phase current sampling in three-phase inverter drives for field-oriented control (FOC) algorithms. IC Role / Device Role / Timing Role: Bipolar ADC interfacing to isolated current shunt amplifiers, accepting ±5V inputs with 13 ns aperture delay to minimize sampling skew. Use Value: 3 µs total acquisition + conversion enables >300 kHz PWM synchronization, supporting high-bandwidth torque control loops. |
Use Scenario: Digitizing ECG/EEG bio-potential signals amplified by low-noise instrumentation amplifiers in portable diagnostic devices. IC Role / Device Role / Timing Role: Precision front-end ADC providing 12-bit resolution with <0.012% full-scale error, referenced to internal 2.0 V REF. Use Value: No missing codes and 72 dB SNR ensure faithful reproduction of low-amplitude physiological waveforms without clipping or quantization artifacts. |
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 |
|---|---|---|---|
| ADS7804U | 12-bit, 100 kSPS, single-ended input, no internal reference, requires external REF and clock. | Lower speed and simplified interface; suited for cost-sensitive, non-bipolar, lower-precision systems. | Select when throughput <100 kSPS suffices and external reference/clock infrastructure already exists. |
| AD7892BRZ | 12-bit, 600 kSPS, ±10V input, internal reference, but uses SPI interface instead of parallel outputs. | Higher speed and serial interface reduce pin count but increase CPU overhead and timing complexity. | Choose for space-constrained designs where microcontroller SPI resources are available and parallel bus is unavailable. |
Compared with ADS7800JU, ADS7804U trades speed and bipolar flexibility for lower cost and simpler supply scheme, while AD7892BRZ offers higher throughput and integrated reference at the expense of parallel bus compatibility and increased firmware integration effort.
Availability
ADS7800JU is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, motor drive feedback, and medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS7800JU 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, embedded processing, and high-reliability ICs, with decades of expertise in precision data converters and industrial-grade components.
The ADS7800JU belongs to TI's legacy high-speed precision SAR ADC family, designed specifically for demanding industrial and instrumentation applications where DC accuracy, AC performance, and robustness over temperature are prioritized over ultra-low power or digital integration.
FAQ
What is the maximum guaranteed conversion time for ADS7800JU over its full operating temperature range?
The ADS7800JU has a maximum guaranteed conversion time of 2.70 µs over –40°C to +85°C, with total acquisition + conversion time limited to 3.0 µs. This value is factory-tested and specified in the SBAS001A datasheet under "Complete Cycle" in the Electrical Specifications table. The ADS7800JU achieves this performance using an internal factory-trimmed clock and high-speed charge redistribution architecture.
Does ADS7800JU require external clock circuitry to operate?
No, ADS7800JU does not require external clock circuitry. It contains a fully integrated, factory-trimmed internal clock that guarantees 333 kHz throughput and 2.70 µs max conversion time. External clocking is neither supported nor necessary - all timing is derived internally, simplifying system design and eliminating clock distribution noise paths that could degrade SNR.
How do I configure ADS7800JU for ±5V versus ±10V input range?
To configure ADS7800JU for ±5V input, connect the analog signal to pin 2 (IN2) and ground pin 1 (IN1). For ±10V input, connect the signal to pin 1 (IN1) and ground pin 2 (IN2). This hardware-selectable range uses internal laser-trimmed scaling resistors - no software configuration or external components are needed. The ADS7800JU datasheet confirms this in the "Analog Input Ranges" section.
Can ADS7800JU operate with only a +5V supply, or does it require a negative rail?
ADS7800JU requires both +5V (applied to pins 23 and 24) and a negative supply (–12V or –15V applied to pin 22) to operate correctly. The –VS rail powers the analog front-end and comparator stages. Operating without –VS violates Absolute Maximum Ratings and will result in non-functional or damaged units. The ADS7800JU datasheet specifies –VS = –15V for all AC/DC performance characterization.
What is the purpose of separate VSA and VSD pins on ADS7800JU?
Pins 23 (VSD) and 24 (VSA) provide physically separate +5V supply connections for digital and analog circuitry, respectively. Though externally tied together, this separation minimizes digital switching noise coupling into the analog core - a key factor in achieving 72 dB SNR and 80 dB SFDR. Layout guidelines in the ADS7800JU datasheet mandate low-inductance tie-point and local bypassing to preserve this isolation benefit.
ADS7800JU Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 333k
- Number of Inputs:
- 1
- Input Type:
- Single Ended
- Data Interface:
- Parallel
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- Internal
- Voltage - Supply, Analog:
- 5V, -11.4V ~ 16.5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 24-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS7800JU FAQ
1.How can I place an order for ADS7800JU through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7800JU 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 ADS7800JU reliable?
The price and inventory of ADS7800JU are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7800JU is usually 5 days.
3.What payment methods are accepted for ADS7800JU?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7800JU transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7800JU?
ADS7800JU orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7800JU 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 ADS7800JU?
For technical support, including ADS7800JU datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7800JU requirements.
6.How does Aetrix verify that ADS7800JU is sourced from the original manufacturer or authorized distributors?
All ADS7800JU 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 ADS7800JU meets industry standards.
7.What is the process for return or replacement of ADS7800JU?
All ADS7800JU units undergo pre-shipment inspection (PSI). If there is an issue with ADS7800JU, 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 ADS7800JU part is unused and in its original packaging.
Return procedure for ADS7800JU:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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