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Analog Devices Inc. AD7524SR-EP
- Part No.:
- AD7524SR-EP
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AD7524SR-EP.pdf
- Description:
- IC DAC 8BIT A-OUT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,698
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Product details
Overview
AD7524SR-EP from Analog Devices is an 8-bit CMOS multiplying DAC with on-chip data latches, designed for direct microprocessor interface (e.g., 8085, 6800, Z80). It delivers ±1/2 LSB relative accuracy at +25°C, supports 2- or 4-quadrant multiplication, and operates from +5 V to +15 V supply. Used in precision AGC circuits and microprocessor-controlled attenuators where endpoint linearity and monotonicity across –55°C to +125°C are required.
For engineers reviewing the AD7524SR-EP datasheet, AD7524SR-EP pinout, AD7524SR-EP application, or AD7524SR-EP equivalent, key selection criteria include guaranteed monotonicity over full temperature range, low power dissipation (<2 mA typical), TTL/CMOS-compatible digital inputs, and compatibility with unipolar/bipolar reference configurations without external latch protection diodes.
Technical Context
The AD7524SR-EP implements an inverted thin-film R-2R ladder architecture with eight N-channel current switches, enabling stable multiplying operation where output current scales linearly with both digital code and analog reference voltage (VREF). Its write cycle mimics RAM "write" timing, with CS and WR control enabling synchronous latch-free data loading.
It supports two operating modes: WRITE (CS = LOW, WR = LOW) for real-time DAC response to DB0–DB7, and HOLD (CS or WR HIGH) to freeze the last loaded value. Output settling time is 500 ns max to 1/2 LSB under 100 Ω + 13 pF load, with feedthrough error limited to 0.5% FSR at 100 kHz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8 bits - defines smallest output step as 1/256 of full-scale range in unipolar mode |
| Relative Accuracy | ±1/2 LSB max - ensures endpoint linearity error stays within half least-significant bit over full scale |
| Supply Range | +5 V to +15 V - enables direct interface to legacy 5 V and industrial 12–15 V logic/system rails |
| Output Settling Time | 500 ns max to 1/2 LSB - supports high-speed microprocessor bus cycles up to ~2 MHz effective update rate |
| Monotonicity | Guaranteed over –55°C to +125°C - eliminates code-dependent output reversal in critical closed-loop gain control |
| Power Dissipation | 2 mA max IDD at +25°C - enables low-heat operation in sealed or convection-limited military/aerospace enclosures |
| Reference Input Impedance | 5 kΩ min to 20 kΩ max at Pin 15 - allows direct connection to precision voltage references without buffer amplification |
Pinout & Package
AD7524SR-EP is housed in a 16-lead narrow-body SOIC package (R-16A), measuring 9.80 mm × 3.94 mm × 1.75 mm, with gull-wing leads and moisture sensitivity level (MSL) 3. Designed for surface-mount reflow assembly in extended-temperature environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (CS) | Chip Select Input | Active-low enable: controls entry into WRITE or HOLD mode; must be LOW with WR for data loading |
| Pin 2 (WR) | Write Strobe Input | Active-low clock: latches DB0–DB7 on falling edge when CS is also LOW |
| Pins 3–10 (DB0–DB7) | Digital Data Inputs | TTL/CMOS-compatible 8-bit parallel bus; MSB = DB7, LSB = DB0; no Schottky clamps required |
| Pin 11 (GND) | Analog/Digital Ground | Common reference for all analog outputs and digital inputs; requires low-impedance PCB tie to system ground plane |
| Pin 12 (VDD) | Positive Supply | +5 V to +15 V power rail; powers internal R-2R ladder, switches, and logic; decoupling capacitor required |
| Pin 13 (OUT2) | Current Output 2 | Complementary output node; carries switched current opposite to OUT1; used with op-amp for bipolar operation |
| Pin 14 (OUT1) | Current Output 1 | Main current output; sinks/sinks current proportional to digital code and VREF; connects to I-to-V op-amp |
| Pin 15 (RIN) | Reference Input | High-impedance node for external VREF (±25 V absolute max); sets full-scale output range and polarity |
| Pin 16 (VREF) | Reference Voltage Input | Not used - pin is NC per functional diagram and pin configuration diagrams; RIN (Pin 15) is sole reference terminal |
Key Features
| Feature | Design Value |
|---|---|
| Latch-free TTL/CMOS interface | Eliminates need for external Schottky clamps; guarantees logic-level compatibility with +5 V microprocessors without added components |
| Endpoint linearity | ±1/2 LSB max nonlinearity ensures accurate end-point calibration in programmable gain amplifier feedback paths |
| 2- and 4-quadrant multiplication | Supports both unipolar (0 to –VREF) and bipolar (–VREF to +VREF) output ranges via offset binary coding |
| Guaranteed monotonicity | Validated over –55°C to +125°C; prevents instability in servo loops or automatic gain control systems across extreme environments |
| Low leakage outputs | ±400 nA max OUT1 leakage at –55°C to +125°C minimizes offset drift in high-gain I-to-V amplifier stages |
Applications
| Microprocessor-Controlled Attenuator | Precision AGC Circuit |
|---|---|
Use Scenario: Programmable RF signal attenuation in test equipment using 8085-based controller and analog multiplier topology. IC Role / Device Role / Timing Role: Multiplying DAC providing digitally set gain coefficient applied to RF envelope detector output before baseband amplification. Use Value: Enables 0.4% step resolution (1/256) and monotonic response across –40°C to +85°C ambient, ensuring repeatable calibration without software correction. |
Use Scenario: Closed-loop amplitude stabilization in satellite transceiver LNA stages exposed to thermal cycling from –55°C to +125°C. IC Role / Device Role / Timing Role: Feedback path DAC converting error voltage to precise analog gain control current for variable-gain amplifier. Use Value: Guaranteed monotonicity and ±1/2 LSB accuracy ensure loop stability and prevent oscillation during temperature transients. |
| Bus-Structured Instrumentation | Microprocessor-Controlled Function Generator |
Use Scenario: Modular benchtop signal source with IEEE-488 (GPIB) interface and local 6800-based control processor. IC Role / Device Role / Timing Role: Digital-to-analog converter generating calibrated DC bias offsets and sweep ramp voltages synchronized to bus write strobes. Use Value: Matched 500 ns settling time and latch-free write cycle align precisely with GPIB handshake timing, eliminating inter-byte jitter. |
Use Scenario: Embedded waveform synthesizer in medical ultrasound front-end, generating programmable pulse shapes via lookup table. IC Role / Device Role / Timing Role: High-speed current-output DAC driving transimpedance amplifier to produce shaped excitation pulses at 1–5 MHz repetition rates. Use Value: 120 pF ON-capacitance at OUT1 and 30 pF OFF-capacitance minimize settling tail artifacts, preserving pulse fidelity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multiplying DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7524SQ | Same die, Cerdip (Q-16) package; ±1/2 LSB accuracy; identical electrical specs and pinout | Higher hermeticity and thermal shock resistance; suited for vacuum or high-reliability aerospace deployments | Select AD7524SQ only if Q-16 ceramic DIP mounting or MIL-STD-883 qualification is required |
| AD7524SE | Same die, E-20A leadless ceramic chip carrier; ±1/2 LSB accuracy; identical timing and analog performance | Higher I/O density and improved thermal conductivity; preferred for compact, high-power-density avionics modules | Choose AD7524SE when board space is constrained and thermal management demands lower junction-to-case resistance |
Compared with AD7524SR-EP, AD7524SQ offers superior environmental sealing but larger footprint and higher assembly cost, while AD7524SE provides better thermal performance in dense layouts but requires specialized reflow profiling for leadless terminations.
Availability
AD7524SR-EP is available at Aetrix Electronics and suitable for precision AGC circuits, microprocessor-controlled attenuators, and bus-structured instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for AD7524SR-EP 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 semiconductor company specializing in high-performance analog, mixed-signal, and digital signal processing technologies for precision measurement and control.
The AD7524 product line delivers radiation-tolerant, extended-temperature DACs optimized for military, aerospace, and industrial systems demanding guaranteed monotonicity and endpoint linearity without calibration.
FAQ
What is the operating temperature range of the AD7524SR-EP?
The AD7524SR-EP is rated for operation from –55°C to +125°C, meeting extended-temperature requirements for aerospace, downhole, and defense applications. This range is validated per the S, T, U grade ordering convention and confirmed in the Absolute Maximum Ratings table and Ordering Guide. All electrical specifications-including monotonicity, settling time, and leakage current-are guaranteed across this full span without derating.
Does the AD7524SR-EP require external latch protection diodes?
No, the AD7524SR-EP does not require external Schottky diodes for input protection. Its improved design guarantees TTL compatibility with a +5 V supply and eliminates the latch-free protection requirement present in earlier versions. The datasheet explicitly states "Latch Free (No Protection Schottky Required)" under FEATURES and confirms compatibility in the GENERAL DESCRIPTION section.
What reference voltage configurations does the AD7524SR-EP support?
The AD7524SR-EP supports both 2-quadrant (unipolar) and 4-quadrant (bipolar) multiplication using a single reference input at Pin 15 (RIN). In unipolar mode, it produces output currents from 0 to –VREF; in bipolar mode, it uses offset binary coding to generate outputs from –VREF to +VREF. Pin 16 is NC-no second reference terminal exists.
How is the AD7524SR-EP interfaced to an 8085 microprocessor?
The AD7524SR-EP interfaces directly to the 8085 using its CS and WR pins tied to IO/M̅ and WR signals respectively, with DB0–DB7 connected to the data bus. Figure 6 in the datasheet shows this exact configuration: no glue logic or address decoding is needed because the AD7524SR-EP's write cycle mirrors standard 8085 memory write timing, including setup/hold requirements verified at 170 ns minimum tCS.
What is the maximum allowable reference voltage for the AD7524SR-EP?
The AD7524SR-EP accepts reference voltages from ±25 V maximum at Pin 15 (RIN), as specified in the Absolute Maximum Ratings table. This allows use with high-voltage precision references such as the REF02 or LT1021-10, enabling full-scale output ranges beyond ±10 V when paired with appropriate external op-amps and feedback networks.
AD7524SR-EP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Number of Bits:
- 8
- Number of D/A Converters:
- 1
- Settling Time:
- 500ns
- Output Type:
- Current - Unbuffered
- Differential Output:
- Yes
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V ~ 15V
- Voltage - Supply, Digital:
- 5V ~ 15V
- INL/DNL (LSB):
- ±0.5 (Max), -
- Architecture:
- R-2R
- Operating Temperature:
- -55°C ~ 125°C
- Supplier Device Package:
- 16-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7524SR-EP FAQ
1.How can I place an order for AD7524SR-EP through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7524SR-EP 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 AD7524SR-EP reliable?
The price and inventory of AD7524SR-EP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7524SR-EP is usually 5 days.
3.What payment methods are accepted for AD7524SR-EP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7524SR-EP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7524SR-EP?
AD7524SR-EP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7524SR-EP 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 AD7524SR-EP?
For technical support, including AD7524SR-EP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7524SR-EP requirements.
6.How does Aetrix verify that AD7524SR-EP is sourced from the original manufacturer or authorized distributors?
All AD7524SR-EP 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 AD7524SR-EP meets industry standards.
7.What is the process for return or replacement of AD7524SR-EP?
All AD7524SR-EP units undergo pre-shipment inspection (PSI). If there is an issue with AD7524SR-EP, 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 AD7524SR-EP part is unused and in its original packaging.
Return procedure for AD7524SR-EP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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