Overview
The AD7305YRZ-REEL, produced by Analog Devices Inc., is a quad, 8-bit Digital-to-Analog Converter (DAC) that operates from a single +3 V to +5 V supply or ±5 V supplies. This component features a parallel interface, making it suitable for applications requiring multiple analog outputs controlled by a digital system. The AD7305 is part of the AD7304/AD7305 family, with the key difference being its parallel input interface, as opposed to the serial interface of the AD7304.
The device is known for its rail-to-rail output swing and internal precision buffers, allowing for full-scale voltage outputs determined by the external reference input voltage. It is also pin-compatible with the industry-standard AD7226 when operating at voltages below +5.5 V.
Key Specifications
| Parameter | Condition | 3 V ± 10% | 5 V ± 10% | ±5 V ± 10% | Unit |
|---|---|---|---|---|---|
| Resolution | 8 | 8 | 8 | Bits | |
| Integral Nonlinearity (INL) | ±1 | ±1 | ±1 | LSB max | |
| Differential Nonlinearity (DNL) | ±1 | ±1 | ±1 | LSB max | |
| Zero-Scale Error (VZSE) | Data = 0x00 | 15 | 15 | ±15 | mV max |
| Full-Scale Voltage Error (VFSE) | Data = 0xFF | ±4 | ±4 | ±4 | LSB max |
| Full-Scale Temperature Coefficient (TCVFS) | 5 | 5 | 5 | ppm/°C typ | |
| Reference Input Range (VREFIN) | VSS/VDD | VSS/VDD | VSS/VDD | V min/max | |
| Input Resistance (RREFIN) | All DACs at code = 0x55 | 7.5 | 7.5 | 7.5 | kΩ typ |
| Input Capacitance (CREFIN) | 5 | 5 | 5 | pF typ | |
| Output Voltage Range (VOUT) | VSS/VDD | VSS/VDD | VSS/VDD | V min/max | |
| Output Current Drive (IOUT) | Code = 0x80, ∆VOUT < 1 LSB | ±3 | ±3 | ±3 | mA typ |
| Shutdown Resistance (ROUT) | DAC outputs placed in shutdown state | 120 | 120 | 120 | kΩ typ |
| Capacitive Load (CL) | No oscillation | 200 | 200 | 200 | pF typ |
| Logic Input Low Voltage (VIL) | 0.6 | 0.8 | 0.8 | V min |
Key Features
- Quad 8-Bit DACs: The AD7305 includes four 8-bit DACs in a single package, allowing for multiple analog outputs from a single digital input.
- Parallel Interface: The AD7305 uses a parallel interface, which is faster and more convenient for applications requiring simultaneous updates of multiple DACs.
- Rail-to-Rail Output Swing: The device features internal precision buffers that allow the output voltage to swing from the negative supply rail to the positive supply rail.
- Wide Supply Voltage Range: Operates from +3 V to +5 V or ±5 V supplies, making it versatile for various system designs.
- Double-Buffered Architecture: Allows all four input registers to be preloaded with new values, followed by an LDAC control strobe that updates the analog output values simultaneously.
- Internal Power-On Reset: Sets the output to zero scale at turn-on, ensuring predictable startup behavior.
- Power Shutdown Feature: A 40 µA power shutdown feature can be activated by tri-stating the A0/SHDN address pin.
- Temperature Range: Specified over the extended industrial (−40°C to +85°C) and automotive (−40°C to +125°C) temperature ranges.
Applications
- Industrial Automation: Suitable for control systems that require multiple analog outputs, such as in process control and automation.
- Aerospace and Defense: Given its wide temperature range and reliability, it is suitable for aerospace and defense applications.
- Medical Devices: Can be used in medical equipment that requires precise analog output control, such as in diagnostic and therapeutic devices.
- Automotive Systems: Applicable in automotive systems that need reliable and precise analog output control, such as in engine control units and safety systems.
- Test and Measurement Equipment: Useful in test and measurement instruments that require multiple precise analog outputs.
Q & A
- What is the resolution of the AD7305 DAC?
The AD7305 has a resolution of 8 bits.
- What is the supply voltage range for the AD7305?
The AD7305 operates from a single +3 V to +5 V supply or ±5 V supplies.
- What type of interface does the AD7305 use?
The AD7305 uses a parallel interface.
- Does the AD7305 have an internal power-on reset feature?
Yes, the AD7305 has an internal power-on reset feature that sets the output to zero scale at turn-on.
- How does the power shutdown feature work on the AD7305?
The power shutdown feature is activated by tri-stating the A0/SHDN address pin, reducing the power consumption to 40 µA.
- What is the temperature range for the AD7305?
The AD7305 is specified over the extended industrial (−40°C to +85°C) and automotive (−40°C to +125°C) temperature ranges.
- Is the AD7305 pin-compatible with any other industry-standard DACs?
Yes, the AD7305 is pin-compatible with the industry-standard AD7226 when operating at voltages below +5.5 V.
- What is the full-scale voltage output range of the AD7305?
The full-scale voltage output range is determined by the external reference input voltage and can swing from the negative supply rail to the positive supply rail.
- Can the AD7305 handle capacitive loads?
Yes, the AD7305 can handle capacitive loads up to 200 pF without oscillation.
- What is the typical output current drive of the AD7305?
The typical output current drive is ±3 mA when the code is 0x80 and ∆VOUT < 1 LSB.
