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Texas Instruments ADS7804PB
- Part No.:
- ADS7804PB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-DIP (0.300", 7.62mm)
- Datasheet:
-
ADS7804PB.pdf
- Description:
- IC ADC 12BIT SAR 28DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,088
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Product details
Overview
ADS7804PB from Texas Instruments is a 12-bit, 100kHz sampling successive approximation register (SAR) analog-to-digital converter with integrated sample/hold, internal +2.5V reference, full parallel output, and ±10V input range. It operates from a single +5V supply, dissipates ≤100mW, and is specified over –40°C to +85°C for industrial data acquisition systems requiring high DC accuracy and low power.
For engineers reviewing the ADS7804PB datasheet, ADS7804PB pinout, ADS7804PB application, or ADS7804PB equivalent, this page delivers verified technical context, real-world timing behavior, package-specific layout guidance, and validated alternative options for precision 12-bit ADC selection in embedded instrumentation and process control.
Technical Context
The ADS7804PB implements a capacitor-based SAR architecture with on-chip sample/hold, clock generator, and three-state parallel output drivers. Its internal 2.5V reference (±0.45 LSB INL, 72dB SINAD at 45kHz) enables ±10V bipolar input scaling without external components, while the 10µs complete conversion cycle supports deterministic timing in microprocessor-controlled acquisition loops.
Control logic uses CS and R/C pins to initiate conversions and enable outputs, with BUSY signaling completion. The device features dual-mode data access-full 12-bit parallel or byte-wise via BYTE pin-and supports both internal and external reference configurations, maintaining guaranteed performance across its industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4.88mV LSB step size over ±10V range for precise voltage measurement. |
| Sampling Rate | 100kHz max - enables 10µs per full conversion cycle including acquisition and digitization. |
| INL Error | ±0.45 LSB max - ensures monotonicity and <0.25% full-scale error for calibrated industrial sensing. |
| SINAD | 72dB min at 45kHz - supports accurate AC signal capture up to 250kHz full-power bandwidth. |
| Supply | +5V single supply - eliminates need for dual rails; VDIG must equal VANA for specified operation. |
| Power Dissipation | 100mW max - enables thermally constrained designs without heatsinking in DIP-28 packaging. |
| Input Range | ±10V differential - compatible with standard industrial sensor outputs and op-amp conditioning stages. |
| Operating Temp | –40°C to +85°C - fully specified for industrial environments without derating. |
Pinout & Package
ADS7804PB is housed in a 28-pin plastic DIP (0.3" width), with pin 1 at top-left when notch faces up. All ground pins (AGND1, AGND2, DGND) must be tied to a common analog ground plane; VDIG and VANA connect to the same +5V source. Decoupling requires 0.1µF ceramic + 10µF tantalum at VANA/V_DIG and 2.2µF tantalum at REF/CAP.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Analog Input | ±10V bipolar input node; 23kΩ impedance, 35pF capacitance; includes ±25V overvoltage protection. |
| 3 REF / 4 CAP | Reference I/O | REF accepts 2.3–2.7V external ref or outputs internal 2.5V; CAP supplies buffered reference current to CDAC. |
| 6–13, 15–18 D11–D0 | Parallel Data Output | 12-bit two's complement output; tri-stated when CS HIGH or R/C LOW; MSB on pin 6, LSB on pin 18. |
| 23 BYTE | Byte Select Control | LOW reads D11–D4 (MSB byte); HIGH reads D3–D0 plus DZ outputs (LSB byte + status). |
| 24 R/C | Read/Convert Control | Falling edge initiates conversion; rising edge enables parallel output; internally OR'd with CS. |
| 25 CS | Chip Select | Active-low enable; falling edge (with R/C LOW) starts conversion; used with R/C for flexible timing control. |
| 26 BUSY | Conversion Status | Active-low open-drain output; goes LOW at conversion start, HIGH after data registers update (≤10µs). |
| 27 VANA / 28 VDIG | Supply Inputs | VANA powers analog section (16mA typical); VDIG powers digital section (0.3mA); must be tied together at +5V. |
Key Features
| Feature | Design Value |
|---|---|
| Complete A/D System | Integrates S/H, reference, clock, and three-state parallel drivers - reduces BOM count and board space vs discrete solutions. |
| Single +5V Operation | Eliminates need for ±12V or ±15V rails; simplifies power design while maintaining ±10V input capability via internal scaling. |
| No Missing Codes | Guaranteed 12-bit monotonicity - critical for closed-loop control where code gaps cause instability or dead zones. |
| Industrial Temperature Range | –40°C to +85°C operation with full specification - enables deployment in factory automation, motor drives, and PLC modules. |
| Pin-Compatible Upgrade Path | Shares footprint and interface with 16-bit ADS7805 - allows resolution scalability without PCB redesign. |
Applications
| Industrial Data Acquisition | Process Control Instrumentation |
|---|---|
|
Use Scenario: High-accuracy voltage monitoring of pressure transducers and RTD signal conditioners in distributed control systems. IC Role / Device Role / Timing Role: Primary 12-bit ADC capturing analog sensor outputs at 100kHz with deterministic 10µs latency for real-time feedback loops. Use Value: ±0.45 LSB INL and 72dB SINAD ensure sub-0.25% full-scale error and clean spectral response for PID tuning and alarm thresholding. |
Use Scenario: Analog input module in programmable logic controllers interfacing with 4–20mA current loops and thermocouple amplifiers. IC Role / Device Role / Timing Role: Bipolar ADC converting ±10V field signals into microprocessor-readable digital values using full parallel bus handshake. Use Value: Single +5V supply and integrated reference reduce external component count, lowering system cost and improving long-term calibration stability. |
| Test & Measurement Equipment | Embedded Motor Drive Monitoring |
|
Use Scenario: Digitizing analog waveforms in portable oscilloscopes and multimeters requiring DC precision and moderate bandwidth. IC Role / Device Role / Timing Role: Core sampling ADC with BUSY-driven latching and BYTE-selectable output for efficient 8-bit microcontroller interfacing. Use Value: 100mW power dissipation and DIP-28 package support compact, fanless instrument designs with thermal headroom. |
Use Scenario: Current and voltage sensing in servo drive feedback paths where isolation and noise immunity are critical. IC Role / Device Role / Timing Role: Isolated analog front-end ADC capturing motor phase currents with ±25V overvoltage tolerance on VIN pin. Use Value: Integrated resistive front end provides inherent overvoltage protection, eliminating need for external clamping diodes or TVS arrays. |
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 |
|---|---|---|---|
| ADS7804P | ±0.9 LSB INL (vs ±0.45 LSB), 70dB SINAD (vs 72dB), same package and pinout. | Lower DC accuracy; suitable for cost-sensitive applications where <0.5% full-scale error is acceptable. | Select ADS7804P only if system-level calibration compensates for higher INL and reduced AC performance. |
| ADS7804UB | SO-28 package (vs DIP-28), identical electrical specs including ±0.45 LSB INL and 72dB SINAD. | Surface-mount assembly required; better thermal performance (θJA = 75°C/W) but no through-hole option. | Choose ADS7804UB for automated production or space-constrained PCBs; ADS7804PB remains optimal for prototyping and manual assembly. |
Compared with ADS7804P and ADS7804UB, the ADS7804PB delivers the highest DC accuracy in a through-hole DIP package-making it ideal for lab-grade instrumentation and legacy industrial hardware where mechanical robustness and hand-soldering compatibility are prioritized.
Availability
ADS7804PB is available at Aetrix Electronics and suitable for industrial data acquisition, process control instrumentation, and test equipment requiring stable component supply, long-lifecycle support, and traceable sourcing.
Supply support for ADS7804PB 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 industrial-grade ICs.
The ADS7804PB belongs to TI's ADS78xx family of monolithic SAR ADCs designed specifically for high-accuracy, low-power industrial measurement applications requiring integrated references and robust noise immunity.
FAQ
What is the maximum sampling rate of the ADS7804PB?
The ADS7804PB is specified for a maximum sampling rate of 100kHz, corresponding to a complete conversion cycle time of 10µs-including acquisition and digitization. This rate is guaranteed over the full –40°C to +85°C industrial temperature range with ±5V supply tolerance and internal reference operation. Performance remains stable under these conditions without derating.
Does the ADS7804PB require external reference components?
The ADS7804PB includes an internal +2.5V reference and operates fully functional with only two external 2.2µF tantalum capacitors on REF and CAP pins. External reference use is optional: applying 2.3–2.7V to REF bypasses the internal reference and improves full-scale accuracy drift to ±2 ppm/°C. No external resistors or buffers are needed unless driving >2mA loads from CAP.
How does the BYTE pin function on the ADS7804PB?
The BYTE pin on the ADS7804PB selects between two 8-bit data access modes: LOW reads D11–D4 (MSB byte) on pins 6–13; HIGH reads D3–D0 plus four DZ status bits on pins 15–22. This enables efficient interfacing with 8-bit microcontrollers without external latches. Data is valid only when CS is LOW and R/C is HIGH, and BUSY is HIGH.
What is the purpose of the DZ pins on the ADS7804PB?
The four DZ pins (19–22) on the ADS7804PB output status information when BYTE is HIGH: they indicate BUSY state, conversion completion, and data validity flags-not data bits. Each DZ pin goes LOW when CS is LOW and R/C is HIGH, providing synchronized handshake signals for microcontroller timing without additional GPIO overhead.
Can the ADS7804PB operate from separate analog and digital supplies?
No-the ADS7804PB requires VDIG and VANA to be tied to the same +5V source, as specified in the absolute maximum ratings and electrical characteristics. Using separate supplies violates the "VDIG must be ≤ VANA" requirement and risks latch-up or degraded linearity. Best practice is to derive both from a clean analog +5V rail, decoupled locally with 0.1µF ceramic and 10µF tantalum capacitors.
ADS7804PB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 28-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 100k
- 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:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS7804PB FAQ
1.How can I place an order for ADS7804PB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS7804PB 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 ADS7804PB reliable?
The price and inventory of ADS7804PB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS7804PB is usually 5 days.
3.What payment methods are accepted for ADS7804PB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS7804PB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS7804PB?
ADS7804PB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS7804PB 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 ADS7804PB?
For technical support, including ADS7804PB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS7804PB requirements.
6.How does Aetrix verify that ADS7804PB is sourced from the original manufacturer or authorized distributors?
All ADS7804PB 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 ADS7804PB meets industry standards.
7.What is the process for return or replacement of ADS7804PB?
All ADS7804PB units undergo pre-shipment inspection (PSI). If there is an issue with ADS7804PB, 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 ADS7804PB part is unused and in its original packaging.
Return procedure for ADS7804PB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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