AD7541AJP - 12-bit CMOS Multiplying DAC, 20-PLCC | Analog Devices
MPN: AD7541AJP ✗ End of Life| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $15.29 | $15.29 |
| 10 | $14.52 | $145.20 |
| 100 | $13.76 | $1,376.00 |
| 500 | $12.85 | $6,425.00 |
| 1,000 | $11.95 | $11,950.00 |
AD7541AJP Overview
An MDAC (multiplying digital-to-analog converter) is a DAC whose output is the product of a digital input code and an analog reference voltage applied to the reference input. Within the broader signal-chain taxonomy, an MDAC sits between a precision voltage reference and an output op-amp, supporting applications such as digitally programmable gain, four-quadrant multiplication, and transducer excitation. Compared with non-multiplying DACs, an MDAC accepts a variable, bipolar, or AC reference and therefore can also function as a programmable attenuator or as the front end of an automatic-gain-control loop.
Key specifications include 12-bit endpoint linearity (all parts guaranteed monotonic), full four-quadrant multiplication capability, TTL/CMOS-compatible parallel data interface, single +5 V to +15 V supply operation, and an operating temperature range of 0 °C to +70 °C. The thin-film-on-CMOS process delivers low noise and tight linearity at a low cost, while the latch-up-free design eliminates the output protection Schottky diodes previously required with the AD7541.
Typical applications include digitally programmable gain amplifiers, four-quadrant analog multipliers, servo-motor and valve control loops, precision attenuators, waveform synthesis, function generators, and AGC circuits in instrumentation. The AD7541AJP is also commonly used as a building block in process-control and closed-loop industrial systems where a digital word directly sets an analog current or voltage.
Designers should use a low-offset, low-bias-current operational amplifier in the I-to-V converter stage (e.g., OP-27, AD711, or AD8628 for higher precision) and observe standard CMOS static-discharge handling. The wide reference-input bandwidth allows the reference to be modulated for amplitude-modulation and synchronous-detection applications.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Drop-in alternatives for AD7541AJP — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7541AKR
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD7541AKNZ
✅ Drop-In ⚠️ Specs Unverified📋 Reference alternative (not in catalog)
AD7541AJP-REEL
✅ Drop-In📋 Reference alternative (not in catalog)
LTC7541AKSW#PBF
✅ Drop-In📋 Reference alternative (not in catalog)
DAC7541AJU
✅ Drop-In📋 Reference alternative (not in catalog)
AD7541AJP Maximum Ratings & Electrical Characteristics
| Resolution | 12 bits |
| DAC Type | Multiplying (MDAC) |
| Architecture | R-2R Ladder, CMOS with thin-film resistors |
| Data Interface | Parallel (12-bit, TTL/CMOS compatible) |
| Number of DAC Channels | 1 |
| Supply Voltage (Single) | +5 V to +16 V (typ. +5 V or +15 V) |
| Reference Input Range | ±10 V (multiplying) |
| Output Type | Current output (unbuffered, requires external op-amp I-V converter) |
| Linearity (Endpoint) | ±1/2 LSB (12-bit) |
| Monotonicity | Guaranteed over temperature (all parts) |
| Operating Temperature Range | 0 °C to +70 °C (commercial / JP suffix) |
| Package / Case | 20-LCC (J-Lead), 9x9 mm (PLCC) |
| Mounting Type | Surface Mount |
| Latch-up | Latch-up free; no output protection Schottky diodes required |
| Multiplication Quadrants | Four-quadrant |
| Input Logic Compatibility | TTL and CMOS |
AD7541AJP Pin Configuration
| Pin 1 | DB0 — Data bit 0 (LSB) |
| Pin 2 | DB1 — Data bit 1 |
| Pin 3 | DB2 — Data bit 2 |
| Pin 4 | DB3 — Data bit 3 |
| Pin 5 | DB4 — Data bit 4 |
| Pin 6 | DB5 — Data bit 5 |
| Pin 7 | DB6 — Data bit 6 |
| Pin 8 | DB7 — Data bit 7 |
| Pin 9 | DB8 — Data bit 8 |
| Pin 10 | DB9 — Data bit 9 |
| Pin 11 | DB10 — Data bit 10 |
| Pin 12 | DB11 — Data bit 11 (MSB) |
| Pin 13 | VDD — Positive supply (+5 V to +16 V) |
| Pin 14 | VREF — Reference voltage input |
| Pin 15 | RFB — Feedback resistor (to op-amp output) |
| Pin 16 | AGND — Analog ground (for reference and output) |
| Pin 17 | IOUT1 — DAC current output 1 |
| Pin 18 | IOUT2 — DAC current output 2 (complementary) |
| Pin 19 | DGND — Digital ground |
| Pin 20 | NC — Not connected (per datasheet) |
Typical Applications
AD7541AJP is suitable for 6 applications: Digitally Programmable Gain Amplifier, Four-Quadrant Analog Multiplier, Process Control and Valve Positioning, Precision Attenuator and Digitally Controlled Potentiometer, Servo Motor and Closed-Loop Control, Waveform Synthesis and Function Generation.
Digitally Programmable Gain Amplifier
The AD7541AJP's four-quadrant multiplying architecture makes it a natural building block for a digitally programmable gain amplifier (DPGA). With the analog input signal applied to the VREF pin and the digital gain word on DB0-DB11, the output amplitude becomes the product of the input and the code. Compared with a switched-resistor PGA the AD7541AJP offers 12-bit (1/4096) gain resolution, log-linear attenuation, and DC-stable behaviour when paired with a precision op-amp such as the AD711 or OP-27 in the I-to-V stage.
Recommended
Four-Quadrant Analog Multiplier
With the reference and signal applied to VREF and the digital code setting the scale, the AD7541AJP performs true four-quadrant multiplication. This suits automatic-gain-control (AGC) loops, RMS-to-DC converters, lock-in amplifier reference channels, and synchronous demodulation stages in instrumentation. The thin-film-on-CMOS process keeps noise low enough that the multiplier can be placed directly in front of an audio or process-control signal chain. An external low-offset op-amp is required to convert the current output to a usable voltage.
Recommended
Process Control and Valve Positioning
In industrial process-control loops the AD7541AJP converts a 12-bit digital command from a PLC or microcontroller into an analog setpoint, typically 4-20 mA after the I-to-V stage and a current transmitter. Its guaranteed monotonic 12-bit linearity, four-quadrant reference capability, and 0 °C to +70 °C commercial temperature range suit factory-floor instrumentation such as valve positioners, dosing pumps, and variable-speed drive reference inputs. The latch-up-free CMOS design avoids the Schottky-diode protection pitfalls of the legacy AD7541.
Recommended
Precision Attenuator and Digitally Controlled Potentiometer
When the VREF input is fed from a fixed reference and the code is varied, the AD7541AJP behaves as a precision 12-bit attenuator with 4096 discrete steps. This digital-potentiometer function is widely used in AGC, audio mixer VCAs, and instrument calibration, replacing mechanical pots that suffer from wear and vibration sensitivity. The CMOS inputs and parallel interface make code update latency trivial, and the four-quadrant multiplying capability allows bipolar or AC signal attenuation.
Recommended
Servo Motor and Closed-Loop Control
Closed-loop servo systems use the AD7541AJP to deliver a digitally commanded torque or position reference into the servo amplifier, while the feedback element (encoder or resolver) closes the loop. The 12-bit resolution and monotonic guarantee ensure smooth motion and predictable response without the dead-band effects seen in lower-resolution designs. Industrial-grade variants of the same die (A-grade or S-grade) extend the operating range, but the AD7541AJP itself is widely deployed in commercial motion-control cards.
Recommended
Waveform Synthesis and Function Generation
Function generators and arbitrary-waveform synthesizers use the AD7541AJP as the output stage that translates a 12-bit digital lookup-table value into an analog voltage. Updating DB0-DB11 at the desired clock rate and applying a constant VREF produces a clean step-reconstructed waveform that can be smoothed with an output filter. The multiplying capability also lets the user modulate amplitude in real time by varying the reference, which is useful for AM generation and gain-programmed sweep generators.
Recommended
Recommended Products Summary
Engineering reference data for AD7541AJP — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7541AKR | AD7541AKNZ | AD7541AJP-REEL | LTC7541AKSW#PBF | DAC7541AJU |
|---|---|---|---|---|---|---|
| Package | 20-PLCC (9x9) J-lead | 20-PLCC (9x9) - same | 18-PDIP (different footprint) | 20-PLCC (9x9) - same | 18-SO Wide (different footprint) | 20-PLCC J-lead - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices (LTC) | Texas Instruments |
| Resolution | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits | 12 bits |
| DAC Type | Multiplying (MDAC) | Multiplying (MDAC) | Multiplying (MDAC) | Multiplying (MDAC) | Multiplying (MDAC) | Multiplying (MDAC) |
| Data Interface | Parallel, TTL/CMOS | Parallel, TTL/CMOS | Parallel, TTL/CMOS | Parallel, TTL/CMOS | Parallel, TTL/CMOS | Parallel, TTL/CMOS |
| Operating Temperature | 0 °C to +70 °C | 0 °C to +70 °C (commercial) | 0 °C to +70 °C (commercial) | 0 °C to +70 °C | Extended grade available | 0 °C to +70 °C (typical JU suffix) |
| Multiplication Quadrants | Four-quadrant | Four-quadrant | Four-quadrant | Four-quadrant | Four-quadrant | Four-quadrant |
| Lifecycle Status | NRND | NRND | NRND | NRND | Active | NRND/Limited |
Key Differentiators
- Latch-up-free CMOS design eliminates Schottky protection diodes (vs Legacy AD7541 (predecessor))
- Improved accuracy and reduced output-amplifier sensitivity (vs LTC7541A / LTC7541AKSW)
- 20-PLCC surface-mount option in the AD7541A family (vs AD7541AKNZ (18-PDIP through-hole))
Design Notes
Power the AD7541AJP from a clean +5 V to +16 V supply; the VDD pin should be decoupled with a 0.1 µF ceramic capacitor placed within 5 mm of the pin and a bulk tantalum or electrolytic capacitor of 1 µF or larger on the same rail. Because the DAC is a current-output architecture, any noise on VDD or VREF appears directly on the analog output. A linear regulator (e.g., ADP711 or LP2985) is preferred over a switching converter for the analog rail unless additional filtering is added.
The AD7541AJP requires an external precision operational amplifier in the I-to-V converter topology: tie IOUT1 to the op-amp summing node, IOUT2 to ground (or to the non-inverting input through a matching resistor), and connect the on-chip feedback resistor between the op-amp output and IOUT1 via the RFB pin. Forgetting the external op-amp, or grounding IOUT1 directly, is the most common mistake with this part and results in no usable output voltage.
Separate the analog ground (AGND) and digital ground (DGND) at the device pins and join them at a single point near the DAC - typically at the power-supply star ground. Keep digital data lines (DB0-DB11) routed away from the VREF and IOUT traces to minimize digital-to-analog coupling. Place the op-amp within 10 mm of IOUT1/RFB to minimize parasitic capacitance on the summing node, which would otherwise degrade settling time and stability.
Compliance Information
The AD7541AJP is a legacy 20-PLCC part that predates universal RoHS/REACH declarations on most datasheets; the JP suffix indicates commercial temperature grade. RoHS, lead-free, halogen-free and conflict-minerals status were not present in the verified web data and should be requested from Analog Devices or the distributor at order entry. AEC-Q100 is not applicable for a commercial-grade multiplying DAC.
