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Analog Devices Inc. AD7545GCQ
- Part No.:
- AD7545GCQ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Digital to Analog Converters (DAC)
- Package:
- 20-CDIP (0.300", 7.62mm)
- Datasheet:
-
AD7545GCQ.pdf
- Description:
- IC DAC 12BIT A-OUT 20CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,061
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Product details
Overview
AD7545GCQ from Analog Devices is a monolithic 12-bit CMOS buffered multiplying DAC with onboard data latches, designed for precision analog output generation in single-supply systems. It features ±1/2 LSB relative accuracy at +25°C, ±1 LSB gain error (VDD = +5 V), and operates from +5 V to +15 V supply. Its 20-terminal cerdip (Q-20) package supports industrial temperature range (–25°C to +85°C) and enables direct interface to 12-/16-bit bus systems in voltage-switching or op-amp-based configurations.
For engineers reviewing the AD7545GCQ datasheet, AD7545GCQ pinout, AD7545GCQ application, or AD7545GCQ equivalent, this page delivers verified technical context, exact pin roles, real-world settling time (2 µs), guaranteed monotonicity, and validated alternatives for unipolar/bipolar D/A conversion, microprocessor interfacing, and battery-powered instrumentation.
Technical Context
The AD7545GCQ implements a current-steering R/2R ladder architecture with N-channel switches routing binary-weighted currents between OUT1 and AGND. Its input latches respond to CS and WR control signals-transparent when both are low, latched otherwise-enabling synchronous or asynchronous data loading without external logic.
It supports true multiplying operation: VREF accepts ±25 V ac/dc signals of either polarity, while RFB provides internal feedback termination. The constant 11 kΩ VREF input resistance (–300 ppm/°C TC) ensures stable scale factor across temperature and signal type, and the code-dependent output capacitance (70–200 pF) is explicitly characterized for stability analysis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit-guarantees 4096 distinct output steps with monotonic behavior over full industrial temperature range. |
| Relative Accuracy | ±1/2 LSB max at +25°C-enables high-fidelity waveform synthesis and closed-loop control without post-calibration. |
| Gain Error | ±1 LSB max at +25°C (VDD = +5 V)-permits elimination of external trim resistors in many precision applications. |
| Current Settling Time | 2 µs max to 1/2 LSB-supports update rates up to 400 kSPS with 100 Ω load and fast op-amp buffering. |
| Supply Range | +5 V to +15 V-allows direct integration into legacy 5 V, mixed-voltage, or higher-voltage industrial power domains. |
| Digital Input Compatibility | TTL-compatible at VDD = +5 V (VIH = 2.4 V, VIL = 0.8 V); CMOS-compatible at VDD = +15 V (VIH = 13.5 V, VIL = 1.5 V). |
| Output Leakage Current | 10 nA max at OUT1-minimizes offset drift in high-impedance summing nodes and precision integrators. |
Pinout & Package
AD7545GCQ uses a 20-lead cerdip (Q-20) package with 0.3" width, rated for –25°C to +85°C operation. Pin 1 is identified by a notch or dot; pins are arranged with analog terminals (OUT1, VREF, AGND, RFB) isolated at one end and digital I/O (DB0–DB11, CS, WR) grouped at the opposite end, separated by VDD and DGND for noise immunity.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Analog output node | Current-summing point of R/2R ladder; connects to op-amp inverting input or reference source in voltage-switching mode. |
| 2 (AGND) | Analog ground reference | Reference for ladder termination resistor; must be tied to DGND at device or via low-inductance path to avoid noise coupling. |
| 3 (VDD) | Positive supply rail | Single supply input (5–15 V); powers digital and analog sections; requires local 0.1 µF bypass to DGND. |
| 4–15 (DB0–DB11) | Parallel digital data inputs | 12-bit wide bus (LSB = DB0, MSB = DB11); CMOS/TTL compatible; 5 pF input capacitance minimizes timing skew. |
| 16 (DGND) | Digital ground reference | Return path for digital logic; must be connected to AGND at single point near AD7545GCQ to prevent ground loops. |
| 17 (RFB) | Internal feedback resistor terminal | Connects to internal 11 kΩ RFB; left open when using external op-amp configuration per Figure 4–6. |
| 18 (VREF) | Reference voltage/current input | Constant 11 kΩ input resistance enables ac/dc, bipolar/unipolar, or current-source drive; ±25 V absolute max rating. |
| 19 (WR) | Write strobe input | Active-low latch control; falling edge loads data when CS is low; 250 ns min pulse width required at VDD = +5 V. |
| 20 (CS) | Chip select input | Active-low enable; must be low with WR to update latches; 280 ns min setup time relative to WR at VDD = +5 V. |
Key Features
| Feature | Design Value |
|---|---|
| Latch-free Schottky protection | No external clamping diodes needed-reduces BOM count and board area in space-constrained designs. |
| Low gain temperature coefficient | Typical 2 ppm/°C (max ±5 ppm/°C)-limits full-scale drift to <0.8 LSB over 100°C span, critical for uncalibrated field instruments. |
| Code-dependent output capacitance | Characterized 70–200 pF range-enables accurate phase compensation design for op-amps like AD544L in high-speed applications. |
| Single-supply voltage switching mode | OUT1 and AGND biasable between DGND and VDD-enables rail-to-rail output swing without dual supplies in portable equipment. |
| Guaranteed monotonicity | 12-bit monotonic over –25°C to +85°C-ensures no missed codes in closed-loop motor control or medical waveform generation. |
Applications
| Unipolar Digital-to-Analog Conversion | Bipolar Twos-Complement Output |
|---|---|
Use Scenario: Generating precise 0 V to –10 V analog control signals from an 8-bit microcontroller in industrial PLC analog output modules. IC Role / Device Role / Timing Role: AD7545GCQ acts as the core multiplying DAC, converting parallel 12-bit data into proportional current output referenced to AGND, buffered by AD544L. Use Value: ±1/2 LSB linearity eliminates need for factory calibration; 2 µs settling enables 100 Hz update rate per channel in multi-channel systems. |
Use Scenario: Producing ±5 V bipolar waveforms in automated test equipment using twos-complement input from FPGA logic. IC Role / Device Role / Timing Role: AD7545GCQ serves as the D/A element in Figure 5 circuit, with MSB inverted externally to convert twos-complement to offset binary before latching. Use Value: Guaranteed 12-bit monotonicity ensures distortion-free sine/cosine generation; constant VREF impedance simplifies reference buffer design. |
| Voltage Switching Mode | Microprocessor Interface |
Use Scenario: Digitally controlled attenuation in RF front-end gain stages where VREF is driven by a 50 Ω RF source. IC Role / Device Role / Timing Role: AD7545GCQ operates in voltage-switching mode (Figure 7): OUT1 tied to VREF, AGND grounded, output taken from VREF pin. Use Value: Constant 11 kΩ VREF input resistance maintains matched impedance across all codes, minimizing reflection and amplitude ripple. |
Use Scenario: Adding analog output capability to Z80-based embedded controllers using memory-mapped I/O. IC Role / Device Role / Timing Role: AD7545GCQ interfaces directly via address bus (Figure 12), with lower 12 address lines driving DB0–DB11 and WR/CS decoded from A15–A12. Use Value: Eliminates external latch ICs; single write instruction updates DAC; 280 ns CS-to-WR setup time ensures reliable timing on 4 MHz Z80 buses. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit multiplying DAC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7545CQ | Same die, plastic DIP (N-20) package; identical ±1/2 LSB accuracy and ±5 LSB gain error at +25°C. | Lower cost and easier hand-soldering; not rated for extended thermal cycling or hermetic sealing. | Select AD7545CQ for lab prototypes or cost-sensitive consumer-grade systems where cerdip reliability is unnecessary. |
| AD7547JRZ | 14-bit resolution, ±1 LSB INL, wider –40°C to +85°C grade, but higher 5 µs settling time and no cerdip option. | Higher resolution for metrology; slower settling limits use in >100 kHz waveform synthesis. | Choose AD7547JRZ only when 14-bit precision outweighs speed and packaging requirements of AD7545GCQ. |
Compared with AD7545CQ, AD7545GCQ offers superior mechanical robustness and hermetic sealing in cerdip packaging for harsh environments, while AD7547JRZ trades speed and package flexibility for two additional bits of resolution-making AD7545GCQ optimal for industrial control where 12-bit fidelity, 2 µs speed, and rugged Q-20 packaging converge.
Availability
AD7545GCQ is available at Aetrix Electronics and suitable for industrial automation, test equipment, and portable instrumentation requiring stable component supply across extended lifecycle programs.
Supply support for AD7545GCQ 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, headquartered in Norwood, MA, with decades of expertise in precision data conversion and signal conditioning.
The AD7545GCQ belongs to Analog Devices' legacy CMOS multiplying DAC product line, engineered specifically for applications demanding low-power, single-supply operation, wide temperature stability, and direct microprocessor interfacing without external latches.
FAQ
What is the maximum operating temperature range for the AD7545GCQ?
The AD7545GCQ is rated for industrial temperature operation from –25°C to +85°C. This range is confirmed in the Ordering Guide table, where "GC" suffix denotes the –25°C to +85°C grade. Absolute maximum ratings allow storage up to +150°C, but functional operation outside the specified range is not guaranteed. The AD7545GCQ maintains its ±1/2 LSB relative accuracy and ±1 LSB gain error specifications across this full industrial range.
Does the AD7545GCQ require external latches when interfacing with an 8-bit microprocessor?
No, the AD7545GCQ does not require external latches due to its integrated 12-bit input data latches controlled by CS and WR signals. As shown in Figure 11 and Figure 12 of the datasheet, it can be directly connected to 8-bit processors like the Z80 or 8080 using either a two-write sequence (lower 8 bits then upper 4 bits) or a single-write address-bus interface. The AD7545GCQ's latch-free design eliminates Schottky diode requirements, reducing system complexity and component count.
Can the AD7545GCQ operate with a 3.3 V digital interface?
No, the AD7545GCQ is not compatible with 3.3 V logic levels. Its digital inputs require TTL-compatible thresholds (VIH = 2.4 V min, VIL = 0.8 V max) only when VDD = +5 V; at other supply voltages, CMOS thresholds apply (e.g., VIH = 13.5 V at VDD = +15 V). Driving DB0–DB11 with 3.3 V signals risks undefined logic states and increased input current. Level-shifting circuitry or a +5 V supply rail is mandatory for reliable operation of the AD7545GCQ.
What is the purpose of the RFB pin on the AD7545GCQ?
The RFB pin on the AD7545GCQ connects to the internal 11 kΩ feedback resistor used in the R/2R ladder network. In standard op-amp configurations (Figures 4–6), RFB is left unconnected because the external op-amp provides feedback. However, in voltage-switching mode (Figure 7), RFB is unused and must remain open. Its presence enables flexible configuration-either internal resistor termination or external precision resistor selection-without modifying the DAC core, preserving the AD7545GCQ's multiplying functionality across diverse analog output topologies.
How does the AD7545GCQ achieve monotonicity despite process variations?
The AD7545GCQ guarantees 12-bit monotonicity over its full industrial temperature range (–25°C to +85°C) through precision laser trimming of the R/2R ladder resistors during manufacturing. This trimming corrects for mismatches that would otherwise cause differential nonlinearity (DNL) exceeding ±1 LSB-ensuring every incremental code change produces a non-decreasing analog output. The datasheet explicitly confirms ±1 LSB max DNL for GL/GC/GU versions, making the AD7545GCQ suitable for closed-loop control and waveform generation where code skipping is unacceptable.
AD7545GCQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- -
- Package/Case:
- 20-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Number of Bits:
- 12
- Number of D/A Converters:
- 1
- Settling Time:
- 2µs
- Output Type:
- Current - Unbuffered
- Differential Output:
- No
- Data Interface:
- Parallel
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V ~ 15V
- Voltage - Supply, Digital:
- 5V ~ 15V
- INL/DNL (LSB):
- ±0.5 (Max), ±1 (Max)
- Architecture:
- R-2R
- Operating Temperature:
- -25°C ~ 85°C
- Supplier Device Package:
- 20-CERDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
AD7545GCQ FAQ
1.How can I place an order for AD7545GCQ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7545GCQ 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 AD7545GCQ reliable?
The price and inventory of AD7545GCQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7545GCQ is usually 5 days.
3.What payment methods are accepted for AD7545GCQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7545GCQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7545GCQ?
AD7545GCQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7545GCQ 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 AD7545GCQ?
For technical support, including AD7545GCQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7545GCQ requirements.
6.How does Aetrix verify that AD7545GCQ is sourced from the original manufacturer or authorized distributors?
All AD7545GCQ 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 AD7545GCQ meets industry standards.
7.What is the process for return or replacement of AD7545GCQ?
All AD7545GCQ units undergo pre-shipment inspection (PSI). If there is an issue with AD7545GCQ, 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 AD7545GCQ part is unused and in its original packaging.
Return procedure for AD7545GCQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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