My Inquiry
My Account
Analog Devices Inc. AD4685BCPZ-RL7
- Part No.:
- AD4685BCPZ-RL7
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WFQFN Exposed Pad, CSP
- Datasheet:
-
AD4685BCPZ-RL7.pdf
- Description:
- 500KSPS SINGLE ENDED DUAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:1,359
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
AD4685BCPZ-RL7 from Analog Devices is a 16-bit, dual simultaneous sampling SAR ADC with 4 single-ended analog inputs, 500 kSPS throughput, ±1.5 LSB INL (typ), 93 dB SNR (with OSR=8), and integrated 2.5 V reference (10 ppm/°C max). It operates from −40°C to +125°C in motor control current sensing and power quality monitoring systems.
For engineers reviewing the AD4685BCPZ-RL7 datasheet, AD4685BCPZ-RL7 pinout, AD4685BCPZ-RL7 application, or AD4685BCPZ-RL7 equivalent, this page delivers verified specs, real-world timing behavior, channel isolation (−109.7 dB), oversampling configuration impact on dynamic range, and thermal performance in LFCSP packaging - all critical for high-reliability industrial signal acquisition.
Technical Context
The AD4685BCPZ-RL7 integrates two independent SAR cores with shared 4-channel multiplexer and hardware sequencer, enabling true simultaneous sampling of two channel pairs (AINA0/AINA1 and AINB0/AINB1) at 500 kSPS. Its internal 2.5 V reference buffer supports external use via REFIO, while configurable oversampling (OSR_MODE, OSR up to 8) reduces noise and relaxes SCLK speed requirements.
It uses standard SPI-compatible serial interface with dual data outputs (SDOA/SDOB), separate logic supply (VLOGIC = 1.65–3.6 V), and alert function triggered by threshold violation on either ADC. Aperture jitter is 20 ps, aperture delay match is 450 ps, and input capacitance is 5 pF in hold mode - key for precision amplifier drive design.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit native; supports resolution boost to 18-bit via oversampling (LSB = 9.55 µV @ 2.5 V ref) |
| Throughput Rate | 500 kSPS per ADC pair (single-channel mode); 250 kSPS alternating channels - defines maximum closed-loop update rate |
| SNR | 93 dB typical with OSR = 8, RES = 1, VREF = 2.5 V - enables >15.5 ENOB for low-noise sensor interfaces |
| INL | ±1.5 LSB typical (−3.5 to +3.5 LSB max) - ensures monotonicity and accurate position/current linearity |
| Channel Isolation | −109.7 dB - prevents crosstalk between motor phase current measurements in multi-axis drives |
| Reference | 2.5 V internal (10 ppm/°C max drift); external reference support up to 3.3 V - allows system-level voltage scaling |
| Operating Temp | −40°C to +125°C - qualified for under-hood automotive and industrial motor control environments |
| Power Dissipation | 17–22 mW (VCC) + 2.6–3.6 mW (VLOGIC) at 500 kSPS - enables thermally constrained PCB layouts |
Pinout & Package
AD4685BCPZ-RL7 is housed in a 16-lead, 3 mm × 3 mm lead frame chip scale package (LFCSP) with exposed pad (EPAD) requiring GND connection. Pin pitch is 0.5 mm; package code CP-16-451; θJA = 55.4°C/W (JEDEC 2S2P board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 10 | GND | Primary ground reference for analog/digital circuitry; EPAD must be soldered to PCB GND plane |
| 2 | VLOGIC | Digital I/O supply (1.65–3.6 V); decoupled with 1 µF capacitor - sets logic level compatibility |
| 3 | REGCAP | Internal regulator decoupling node (1.9 V typical); requires 1 µF to GND for stable core bias |
| 4 | VCC | Analog power supply (3.0–3.6 V); decoupled with 1 µF capacitor - directly impacts SNR and THD |
| 5, 6 | AINB1, AINB0 | Single-ended analog inputs for ADC B; 0–VREF range; 18 pF input capacitance in track mode |
| 7, 8 | AINA1, AINA0 | Single-ended analog inputs for ADC A; simultaneous sampling with AINBx - essential for vector control |
| 9 | REFCAP | Bandgap reference decoupling (2.5 V typical); 0.1 µF required only when using internal reference |
| 11 | REFIO | Reference I/O: output 2.5 V (buffered) or input 2.5–3.3 V - must be decoupled with 1 µF for stability |
| 12 | CS | Active-low chip select; initiates conversion and frames SPI transfers; tQUIET = 10 ns before conversion |
| 13 | SDOA | Serial data output A; carries ADC A or B results and register reads - series 100 Ω resistor recommended |
| 14 | SDOB/ALERT | Dual-function pin: SDOB (data) or ALERT (open-drain active-low threshold indicator) |
| 15 | SDI | Serial data input; writes to CONFIGURATION1/2, ALERT registers - setup/hold times are 1 ns each |
| 16 | SCLK | Serial clock input; min period = 25 ns (40 MHz max); tSCLKH/tSCLKL ≥ 10 ns - constrains MCU SPI peripheral config |
Key Features
| Feature | Design Value |
|---|---|
| Dual simultaneous sampling | Enables true time-aligned capture of two current/voltage pairs - eliminates phase skew in field-oriented control |
| On-chip oversampling block | Configurable OSR up to 8; improves SNR by 5.5 dB and reduces effective SCLK frequency requirement by 8× |
| Integrated 2.5 V reference | 10 ppm/°C max drift over −40°C to +125°C - eliminates external reference component and layout area |
| Alert function | Hardware interrupt on out-of-range conversion result - enables real-time fault detection without host polling |
| Channel sequencer mode | Automatically cycles through 4 inputs (AINA0→AINA1→AINB0→AINB1); reduces software overhead in data acquisition |
| Small sampling capacitor (15 pF) | Reduces amplifier drive burden and settling time - compatible with low-power op-amps like ADA4807-2 |
Applications
| Motor Control Current Sense | Power Quality Monitoring |
|---|---|
Use Scenario: Real-time measurement of phase currents in 3-phase inverter drives for field-oriented control (FOC). IC Role / Device Role / Timing Role: Dual simultaneous sampling ADC captures AINA0/AINA1 (Phase A/B) and AINB0/AINB1 (Phase C/DC link) with <450 ps inter-channel delay match. Use Value: Enables precise torque ripple suppression and overcurrent protection with 16-bit resolution and −109.7 dB channel isolation. |
Use Scenario: High-fidelity voltage and current waveform capture in smart grid meters and harmonic analyzers. IC Role / Device Role / Timing Role: Simultaneous sampling of voltage and current transducer outputs with 500 kSPS sustained rate and 93 dB SNR (OSR=8). Use Value: Supports IEC 61000-4-30 Class A compliance with >15.5 ENOB and <±1.5 LSB INL across temperature. |
| Sonar Signal Acquisition | Erbium-Doped Fiber Amplifier (EDFA) |
Use Scenario: Digitizing echo return signals in underwater or industrial ultrasonic distance sensors. IC Role / Device Role / Timing Role: Low-jitter (20 ps) SAR ADC with 22 MHz input bandwidth and 5.3 MHz −0.1 dB flatness for wideband pulse capture. Use Value: Delivers 85.3 dB SNR at 100 kHz input - sufficient for sub-millimeter ranging resolution in time-of-flight systems. |
Use Scenario: Monitoring pump laser diode current and photodiode feedback in optical amplifiers for telecom infrastructure. IC Role / Device Role / Timing Role: High-accuracy, high-speed ADC for closed-loop bias control with alert-triggered shutdown on overcurrent events. Use Value: Integrated alert function and −40°C to +125°C operation ensure reliability in uncooled EDFA modules with minimal BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-sampling SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD4684BCPZ-RL7 | Same pinout and architecture, but 1 MSPS throughput (vs. 500 kSPS); higher power (8.5 mA vs. 6 mA IVCC) | Preferred where higher loop bandwidth is needed (e.g., servo motor control), but requires tighter thermal management | Select AD4684BCPZ-RL7 only if 1 MSPS is required; AD4685BCPZ-RL7 offers better power efficiency at 500 kSPS |
| AD7616BSTZ | 16-bit, 16-channel, simultaneous sampling; no integrated reference; larger 64-lead LQFP package; 250 kSPS per channel | Used in high-channel-count DAQ systems (e.g., vibration analysis), not optimized for compact dual-channel motor control | Choose AD7616BSTZ for >4-channel needs; AD4685BCPZ-RL7 provides superior integration and smaller footprint for 4-channel designs |
Compared with AD4684BCPZ-RL7, AD4685BCPZ-RL7 trades 2× lower throughput for 25% lower power and relaxed thermal design; versus AD7616BSTZ, it delivers identical resolution in half the package size and with integrated reference - making it optimal for space-constrained dual-signal industrial edge nodes.
Availability
AD4685BCPZ-RL7 is available at Aetrix Electronics and suitable for motor control position feedback, power quality monitoring, and sonar signal acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD4685BCPZ-RL7 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 is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.
The AD4684/AD4685 product line was designed specifically for high-precision, high-reliability industrial signal acquisition - emphasizing simultaneous sampling integrity, wide temperature operation, and integrated reference stability in compact LFCSP packaging.
FAQ
What is the maximum sampling rate of the AD4685BCPZ-RL7?
The AD4685BCPZ-RL7 achieves a maximum throughput rate of 500 kSPS in single-channel-pair mode (SEQ = 0) and 250 kSPS in alternating-channel mode (SEQ = 1). This is confirmed in Table 1 of the Rev. A datasheet under "THROUGHPUT" with test conditions specifying TA = −40°C to +125°C and no oversampling enabled. The AD4685BCPZ-RL7 is rated for 500 kSPS - not 1 MSPS - distinguishing it from the pin-compatible AD4684BCPZ-RL7.
Does the AD4685BCPZ-RL7 include an internal voltage reference?
Yes, the AD4685BCPZ-RL7 integrates a buffered 2.5 V internal reference with a maximum temperature coefficient of 10 ppm/°C over −40°C to +125°C, as specified in Table 1 (REFERENCE INPUT AND OUTPUT section). The reference is accessible via the REFIO pin and requires a 1 µF decoupling capacitor. External references from 2.5 V to 3.3 V are also supported, selected via the REFSEL bit in CONFIGURATION1 register.
How many analog input channels does the AD4685BCPZ-RL7 support?
The AD4685BCPZ-RL7 supports four single-ended analog inputs: AINA0, AINA1 (for ADC A), and AINB0, AINB1 (for ADC B), as shown in Figure 6 and Table 6 of the datasheet. These are organized into two simultaneously sampled pairs, enabling true dual-channel acquisition - critical for vector control and differential measurement applications.
What package type is used for the AD4685BCPZ-RL7?
The AD4685BCPZ-RL7 uses a 16-lead, 3 mm × 3 mm lead frame chip scale package (LFCSP) with exposed pad (EPAD), designated CP-16-451 in Analog Devices' ordering guide. Thermal resistance is θJA = 55.4°C/W (JEDEC 2S2P board), and the EPAD must be soldered to PCB ground for proper thermal and electrical performance.
Can the AD4685BCPZ-RL7 operate over the full industrial temperature range?
Yes, the AD4685BCPZ-RL7 is fully specified from −40°C to +125°C ambient temperature, as stated in the General Description, Product Highlights, and Absolute Maximum Ratings (Table 3). All key specifications - including INL (±1.5 LSB typ), SNR (93 dB with OSR), and reference drift (10 ppm/°C max) - are guaranteed across this range, making it suitable for under-hood automotive and industrial motor drive applications.
AD4685BCPZ-RL7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-WFQFN Exposed Pad, CSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 500k
- Number of Inputs:
- 4
- Input Type:
- Single Ended
- Data Interface:
- Serial
- Configuration:
- MUX-ADC
- Ratio - S/H:ADC:
- 0:2
- Number of A/D Converters:
- 2
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 3V ~ 3.6V
- Voltage - Supply, Digital:
- 3V ~ 3.6V
- Features:
- Simultaneous Sampling
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-LFCSP (3x3)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD4685BCPZ-RL7 FAQ
1.How can I place an order for AD4685BCPZ-RL7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AD4685BCPZ-RL7 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 AD4685BCPZ-RL7 reliable?
The price and inventory of AD4685BCPZ-RL7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD4685BCPZ-RL7 is usually 5 days.
3.What payment methods are accepted for AD4685BCPZ-RL7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD4685BCPZ-RL7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD4685BCPZ-RL7?
AD4685BCPZ-RL7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD4685BCPZ-RL7 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 AD4685BCPZ-RL7?
For technical support, including AD4685BCPZ-RL7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD4685BCPZ-RL7 requirements.
6.How does Aetrix verify that AD4685BCPZ-RL7 is sourced from the original manufacturer or authorized distributors?
All AD4685BCPZ-RL7 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 AD4685BCPZ-RL7 meets industry standards.
7.What is the process for return or replacement of AD4685BCPZ-RL7?
All AD4685BCPZ-RL7 units undergo pre-shipment inspection (PSI). If there is an issue with AD4685BCPZ-RL7, 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 AD4685BCPZ-RL7 part is unused and in its original packaging.
Return procedure for AD4685BCPZ-RL7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
AD4685BCPZ-RL7 Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
