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Analog Devices Inc. AD7853BN
- Part No.:
- AD7853BN
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-DIP (0.300", 7.62mm)
- Datasheet:
-
AD7853BN.pdf
- Description:
- IC ADC 12BIT SRL 200KSPS 24-DIP
- Quantity:
- Payment:
- Shipping:
Inventory:323
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Product details
Overview
AD7853BN from Analog Devices is a 12-bit, 200 kSPS pseudo-differential successive-approximation ADC operating from a single 3 V to 5.5 V supply. It features on-chip 2.5 V reference, system/self-calibration, flexible SPI/8051-compatible serial interface, and 24-lead DIP package. Used in battery-powered instrumentation requiring high-speed, low-power analog-to-digital conversion with guaranteed no missing codes.
For engineers reviewing the AD7853BN datasheet, AD7853BN pinout, AD7853BN application, or AD7853BN equivalent, this page delivers verified specifications, calibrated DC accuracy (±0.5 LSB INL at 5 V ref), timing-critical interface modes (Modes 1–5), power-down states (25 µW sleep), and real-world use context for portable medical devices, modems, and pen computers.
Technical Context
The AD7853BN implements a charge-redistribution SAR architecture with integrated track-and-hold (500 ns acquisition), internal 2.5 V reference, and programmable analog input ranges (0 to VREF or ±VREF/2). Its calibration memory retains offset/gain coefficients across power cycles.
It supports five serial interface modes via SM1/SM2 pins, including external-clock (SCLK input) and self-clocking (SCLK output) configurations, with POLARITY pin selecting SCLK idle state. Conversion is initiated by CONVST edge or software write to control register.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = 0.024% of full-scale range with guaranteed no missing codes |
| Throughput Rate | 200 kSPS - enables real-time sampling of signals up to 100 kHz Nyquist bandwidth |
| INL (B Grade) | ±0.5 LSB max - ensures monotonicity and <0.012% absolute linearity error with 5 V external reference |
| Power Dissipation | 20 mW max at 5.5 V - includes AVDD/DVDD current draw; drops to 25 µW in full power-down mode |
| Reference Voltage | 2.5 V internal - stable output with 20 ppm/°C tempco; supports external override from 1.2 V to AVDD |
| Analog Input Range | 0 to VREF (unipolar) or ±VREF/2 (bipolar) - selectable via AMODE pin; AIN(+) must not fall below AIN(–) in unipolar mode |
| Track/Hold Acquisition | 500 ns - allows accurate sampling of fast transients without external hold circuitry |
Pinout & Package
AD7853BN is supplied in a 24-lead plastic dual-in-line package (N-24), 0.3 inch wide, with through-hole mounting and standard DIP pin spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CONVST | Convert Start trigger | Rising-edge initiates T/H hold and conversion; unused pin must be tied to DVDD |
| 2 BUSY | Conversion status indicator | Active-high open-drain output; asserts during conversion and calibration sequences |
| 3 SLEEP | Low-power mode control | Logic 0 powers down all circuitry except calibration memory; retains reference and coefficients |
| 4 REFIN/REFOUT | Reference I/O node | Supplies 2.5 V internal reference; accepts external reference from 1.2 V to AVDD; requires CREF1/CREF2 decoupling |
| 5 AVDD | Analog supply rail | +3.0 V to +5.5 V; must be decoupled to AGND; isolated from DVDD to minimize digital noise coupling |
| 6,12 AGND | Analog ground reference | Common return for T/H, DAC, and reference; separate from DGND to preserve SNR |
| 7 CREF1 | Reference charge reservoir | Connects 0.1 µF multilayer ceramic capacitor to AGND; stabilizes DAC switching transients |
| 8 CREF2 | Reference bypass | Connects 0.01 µF ceramic disc capacitor to AGND; filters high-frequency reference noise |
| 9 AIN(+) | Pseudo-differential positive input | Input voltage must stay within AGND to AVDD; cannot go below AIN(–) in unipolar mode |
| 10 AIN(–) | Pseudo-differential negative input | Bias point for input range selection; must remain ≥ AGND and ≤ AVDD |
| 11 NC | No-connect | Not internally bonded; must remain floating or grounded per layout best practice |
| 13 AMODE | Analog range selector | Logic 0 → 0 to VREF unipolar; Logic 1 → ±VREF/2 bipolar; sets input common-mode constraints |
| 14 POLARITY | SCLK idle-state control | Logic 1 → SCLK idles high; Logic 0 → SCLK idles low; determines active clock edge per interface mode |
| 15 SM1 / 16 SM2 | Serial interface mode select | Two-pin encoding selects among 5 SPI/8051-compatible protocols (Modes 1–5); defines SYNC/SCLK direction and framing |
| 17 CAL | Calibration initiator | Rising edge triggers self-calibration; 10 nF cap to DGND enables autocal on power-up; internal 0.15 µA pull-up |
| 18 DVDD | Digital supply rail | +3.0 V to +5.5 V; must match AVDD voltage; decoupled separately to DGND |
| 19 DGND | Digital ground reference | Return for logic I/O; kept separate from AGND to prevent digital switching noise from modulating analog path |
| 20 DOUT | Serial data output | 16-bit MSB-first output; three-state controlled by SYNC; compatible with 8051, SPI, QSPI, and µP buses |
| 21 DIN | Serial data input | 16-bit command/data input; functions as bidirectional I/O in self-clocking modes (4/5) |
| 22 CLKIN | Master clock input | 4 MHz nominal for AD7853BN; sets conversion time (4.6 µs), calibration duration, and timing margins |
| 23 SCLK | Serial clock | Configured as input (Modes 1–3) or output (Modes 4–5); polarity set by POLARITY pin |
| 24 SYNC | Frame synchronization | Chip-select-like input (Modes 1–3) or frame-sync output (Modes 4–5); controls DOUT/DIN tri-state behavior |
Key Features
| Feature | Design Value |
|---|---|
| Autocalibration on power-up | Eliminates manual calibration step; 31.25 ms full self-cal time at 4 MHz CLKIN ensures factory-trimmed accuracy at startup |
| Flexible power management | Three distinct states: normal (20 mW), partial power-down (400 µA), and full power-down (5 µA with clock off) |
| Pseudo-differential input architecture | Rejects common-mode noise on AIN(+) and AIN(–); supports both unipolar (0–VREF) and bipolar (±VREF/2) signal conditioning |
| 5 serial interface modes | Hardware-configurable via SM1/SM2/POLARITY pins - eliminates firmware rework when migrating between µP families (8051/SPI/QSPI) |
| On-chip 2.5 V reference | 20 ppm/°C tempco and 2.3 V–2.7 V output tolerance enable stable conversions without external reference ICs |
Applications
| Portable Medical Instrumentation | High-Speed Modem Signal Acquisition |
|---|---|
|
Use Scenario: Real-time ECG waveform digitization in handheld diagnostic devices with limited battery capacity. IC Role / Device Role / Timing Role: Primary analog front-end ADC capturing 100+ Hz biopotential signals with 12-bit resolution and minimal power overhead. Use Value: 25 µW sleep mode extends battery life; ±0.5 LSB INL ensures clinical-grade amplitude fidelity; 200 kSPS supports oversampling for noise reduction. |
Use Scenario: Digitizing baseband analog signals in V.34/V.90 modem receivers before DSP processing. IC Role / Device Role / Timing Role: High-throughput sampling engine interfacing directly to analog filter outputs and DSP serial ports. Use Value: 500 ns track/hold acquisition captures fast slewing signals; SPI-compatible interface simplifies glueless connection to TI C54x or ADSP-21xx processors. |
| Pen-Based Computing Systems | Industrial Data Loggers |
|
Use Scenario: Converting stylus pressure and coordinate signals in tablet PCs with resistive touch overlays. IC Role / Device Role / Timing Role: Dual-channel pseudo-differential ADC acquiring X/Y position and Z (pressure) inputs synchronously. Use Value: AMODE-selectable input ranges accommodate varying sensor output spans; on-chip reference removes need for precision external VREF. |
Use Scenario: Monitoring temperature, voltage, and current in remote industrial nodes powered by solar/battery hybrid systems. IC Role / Device Role / Timing Role: Low-power measurement subsystem performing scheduled wake-up conversions and returning to microamp sleep. Use Value: Full self-calibration on wake-up compensates for thermal drift; 2.5 V reference stability over –40°C to +85°C ensures consistent accuracy across environmental extremes. |
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 |
|---|---|---|---|
| AD7853BR | Same core ADC, but in 24-lead SOIC (R-24) package - smaller footprint, surface-mount only | Preferred for space-constrained PCBs; thermal impedance higher (θJA = 75°C/W vs. 105°C/W for DIP) | Select AD7853BR when board area is critical and reflow assembly is available; AD7853BN remains optimal for prototyping and through-hole production. |
| AD7853LAN | Low-power variant (AD7853L) in same N-24 package; 100 kSPS max, 6.85 mW typical power | Targeted at ultra-low-duty-cycle systems where throughput >100 kSPS is unnecessary | Choose AD7853LAN only if application requires <100 kSPS - AD7853BN delivers 2× speed with identical pinout and calibration architecture. |
Compared with AD7853BR and AD7853LAN, the AD7853BN uniquely combines DIP package accessibility, 200 kSPS performance, and B-grade ±0.5 LSB INL - making it the preferred choice for bench-ready instrumentation and mixed-technology assemblies where solderability and debug visibility matter.
Availability
AD7853BN is available at Aetrix Electronics and suitable for portable medical instrumentation, high-speed modem signal acquisition, and industrial data loggers requiring stable component supply with long-term manufacturability.
Supply support for AD7853BN 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
Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.
The AD7853 family was designed for portable, battery-operated measurement systems needing high-speed, low-power 12-bit conversion with integrated reference and calibration - targeting medical, telecom, and industrial edge sensing.
FAQ
What is the maximum sampling rate supported by the AD7853BN?
The AD7853BN supports a maximum throughput rate of 200 kSPS under specified conditions (AVDD = DVDD = 3.0 V to 5.5 V, fCLKIN = 4 MHz, TA = –40°C to +85°C). This corresponds to a minimum conversion time of 4.6 µs. The actual achievable rate depends on interface mode timing margins and bus turnaround overhead - Mode 4 or 5 with self-clocking typically delivers sustained 200 kSPS in systems with compatible serial controllers.
Does the AD7853BN require external reference components?
Yes, the AD7853BN requires two external capacitors: a 0.1 µF multilayer ceramic capacitor (CREF1) and a 0.01 µF ceramic disc capacitor (CREF2), both connected between their respective pins (7 and 8) and AGND. These stabilize the internal reference and DAC charge redistribution. No external voltage reference IC is needed - the part provides a 2.5 V ±0.2 V output at the REFIN/REFOUT pin.
How does the AD7853BN handle calibration, and can it be performed in-system?
The AD7853BN supports both self-calibration (adjusting internal DAC offsets/gains) and system calibration (correcting external front-end errors). Calibration is triggered by a rising edge on the CAL pin or via software command. Full self-calibration takes 31.25 ms at 4 MHz CLKIN and retains coefficients in on-chip memory. System calibration requires user-provided reference voltages and is fully in-system executable without test equipment.
What are the valid logic voltage levels for digital inputs on the AD7853BN?
Digital input thresholds depend on supply voltage: at DVDD = 3.0 V to 3.6 V, VINH ≥ 2.1 V and VINL ≤ 0.6 V; at DVDD = 4.5 V to 5.5 V, VINH ≥ 2.4 V and VINL ≤ 0.8 V. All digital inputs (except CONVST, SLEEP, CAL, SYNC) reference DGND; those four reference DVDD. Input leakage is ±10 µA max, and input capacitance is ≤10 pF - compatible with standard CMOS drivers.
Can the AD7853BN operate with a 3.3 V supply, and what impact does that have on performance?
Yes, the AD7853BN is fully specified for AVDD/DVDD = 3.0 V to 5.5 V. At 3.3 V, power dissipation drops to ~15 mW (normal mode), sleep current remains at 5 µA (clock off), and DC accuracy (±0.5 LSB INL) is maintained with a 2.5 V external reference. Dynamic performance (SNR = 71 dB, THD = –78 dB) is preserved per datasheet test conditions - no derating required for 3.3 V operation.
AD7853BN Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- *
- Package/Case:
- 24-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- 24-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7853BN FAQ
1.How can I place an order for AD7853BN through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7853BN 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 AD7853BN reliable?
The price and inventory of AD7853BN are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7853BN is usually 5 days.
3.What payment methods are accepted for AD7853BN?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7853BN transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7853BN?
AD7853BN orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7853BN 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 AD7853BN?
For technical support, including AD7853BN datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7853BN requirements.
6.How does Aetrix verify that AD7853BN is sourced from the original manufacturer or authorized distributors?
All AD7853BN 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 AD7853BN meets industry standards.
7.What is the process for return or replacement of AD7853BN?
All AD7853BN units undergo pre-shipment inspection (PSI). If there is an issue with AD7853BN, 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 AD7853BN part is unused and in its original packaging.
Return procedure for AD7853BN:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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