AD7541AJP - 12-bit CMOS Multiplying DAC, 20-PLCC | Analog Devices
부품 번호: AD7541AJP ✗ 단종| 수량 | 단가 | 합계 |
|---|---|---|
| 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 개요
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.
드롭인 대체품: AD7541AJP — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
AD7541AKR
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD7541AKNZ
✅ 드롭인 ⚠️ 사양 미검증📋 참조 대체품 (카탈로그에 없음)
AD7541AJP-REEL
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
LTC7541AKSW#PBF
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
DAC7541AJU
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
AD7541AJP 최대 정격 & 전기적 특성
| 분해능 | 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) |
| 출력 유형 | Current output (unbuffered, requires external op-amp I-V converter) |
| Linearity (Endpoint) | ±1/2 LSB (12-bit) |
| Monotonicity | Guaranteed over temperature (all parts) |
| 동작 온도 범위 | 0 °C to +70 °C (commercial / JP suffix) |
| 패키지 / 케이스 | 20-LCC (J-Lead), 9x9 mm (PLCC) |
| 실장 유형 | Surface Mount |
| Latch-up | Latch-up free; no output protection Schottky diodes required |
| Multiplication Quadrants | Four-quadrant |
| Input Logic Compatibility | TTL and CMOS |
AD7541AJP 핀 구성
| 핀 1 | DB0 — Data bit 0 (LSB) |
| 핀 2 | DB1 — Data bit 1 |
| 핀 3 | DB2 — Data bit 2 |
| 핀 4 | DB3 — Data bit 3 |
| 핀 5 | DB4 — Data bit 4 |
| 핀 6 | DB5 — Data bit 5 |
| 핀 7 | DB6 — Data bit 6 |
| 핀 8 | DB7 — Data bit 7 |
| 핀 9 | DB8 — Data bit 8 |
| 핀 10 | DB9 — Data bit 9 |
| 핀 11 | DB10 — Data bit 10 |
| 핀 12 | DB11 — Data bit 11 (MSB) |
| 핀 13 | VDD — Positive supply (+5 V to +16 V) |
| 핀 14 | VREF — Reference voltage input |
| 핀 15 | RFB — Feedback resistor (to op-amp output) |
| 핀 16 | AGND — Analog ground (for reference and output) |
| 핀 17 | IOUT1 — DAC current output 1 |
| 핀 18 | IOUT2 — DAC current output 2 (complementary) |
| 핀 19 | DGND — Digital ground |
| 핀 20 | NC — Not connected (per datasheet) |
일반적인 애플리케이션
AD7541AJP 적합 용도: 6 애플리케이션s: 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.
추천
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.
추천
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.
추천
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.
추천
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.
추천
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.
추천
추천 제품 요약
엔지니어링 참조 데이터: AD7541AJP — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | 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 |
주요 차별점
- 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))
설계 노트
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.
규정 준수 정보
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.
