Overview
The AD7305BRUZ is a quad, 8-bit digital-to-analog converter (DAC) produced by Analog Devices Inc. This component operates from a single +3 V to +5 V supply or ±5 V supplies, making it versatile for various applications. The AD7305 features a parallel interface, which distinguishes it from its serial interface counterpart, the AD7304. It is housed in a 20-lead TSSOP package, ensuring compact integration into diverse systems.
The device includes internal precision buffers that allow rail-to-rail output voltage swing, and its reference input range spans from the negative to the positive supply rails. This flexibility enables the full-scale voltage output to be set to any value within the supply range. An internal power-on reset sets the output to zero scale at turn-on, and a 40 µA power shutdown feature is available for power management.
Key Specifications
| Parameter | Symbol | Condition | 3 V ± 10% | 5 V ± 10% | ±5 V ± 10% | Unit |
|---|---|---|---|---|---|---|
| Resolution | N | 8 | 8 | 8 | Bits | |
| Integral Nonlinearity | INL | ±1 | ±1 | ±1 | LSB max | |
| Differential Nonlinearity | DNL | Monotonic, all codes 0 to 0xFF ±1 | Monotonic, all codes 0 to 0xFF ±1 | Monotonic, all codes 0 to 0xFF ±1 | LSB max | |
| Zero-Scale Error | VZSE | Data = 0x00 | ±15 mV | ±15 mV | ±15 mV | mV max |
| Full-Scale Voltage Error | VFSE | Data = 0xFF | ±4 LSB | ±4 LSB | ±4 LSB | LSB max |
| Full-Scale Temperature Coefficient | TCVFS | 5 ppm/°C typ | 5 ppm/°C typ | 5 ppm/°C typ | ppm/°C typ | |
| Reference Input Range | VREFIN | VSS/VDD | VSS/VDD | VSS/VDD | V min/max | |
| Input Resistance (AD7305) | RREFIN | All DACs at code = 0x55 | 7.5 kΩ typ | 7.5 kΩ typ | 7.5 kΩ typ | kΩ typ |
| Output Voltage Range | VOUT | VSS/VDD | VSS/VDD | VSS/VDD | V min/max | |
| Output Current Drive | IOUT | Code = 0x80, ∆VOUT < 1 LSB | ±3 mA typ | ±3 mA typ | ±3 mA typ | mA typ |
| Shutdown Resistance | ROUT | DAC outputs placed in shutdown state | 120 kΩ typ | 120 kΩ typ | 120 kΩ typ | kΩ typ |
| Capacitive Load | CL | No oscillation | 200 pF | 200 pF | 200 pF | pF |
| Logic Input Low Voltage | VIL | 0.6 V min | 0.8 V min | 0.8 V min | V min |
Key Features
- Quad 8-Bit DACs: Four independent DACs in a single package, each with 8-bit resolution.
- Flexible Supply Operation: Operates from a single +3 V to +5 V supply or ±5 V supplies.
- Parallel Interface: The AD7305 uses a parallel interface with standard address decode and WR control line for loading data into input registers.
- Rail-to-Rail Output: Internal precision buffers allow rail-to-rail output voltage swing.
- Double-Buffered Architecture: Allows preloading of new values into input registers before updating the DAC registers with an LDAC control strobe.
- Internal Power-On Reset: Sets the output to zero scale at turn-on.
- Power Shutdown Feature: A 40 µA power shutdown feature 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 Control Systems: Suitable for applications requiring multiple analog outputs, such as process control and automation.
- Automotive Systems: Meets the automotive temperature range, making it suitable for automotive control systems and instrumentation.
- Medical Devices: Can be used in medical devices that require precise analog output control, such as patient monitoring systems.
- Consumer Electronics: Applicable in consumer electronics that need multiple DAC channels, such as audio equipment and display systems.
- Test and Measurement Equipment: Useful in test and measurement instruments that require multiple analog output channels.
Q & A
- What is the resolution of the AD7305 DAC?
The AD7305 has a resolution of 8 bits.
- What are the supply voltage options for the AD7305?
The AD7305 can operate 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.
- What is the purpose of the double-buffered architecture in the AD7305?
The double-buffered architecture allows preloading of new values into the input registers before updating the DAC registers with an LDAC control strobe.
- How is the power shutdown feature activated on the AD7305?
The power shutdown feature is activated by tri-stating the A0/SHDN address pin.
- 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.
- What is the output voltage range of the AD7305?
The output voltage range of the AD7305 is from VSS to VDD.
- 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.
- What is the typical output current drive of the AD7305?
The typical output current drive of the AD7305 is ±3 mA.
- Is the AD7305 pin-compatible with any other industry-standard DACs?
Yes, the AD7305 is pin-compatible with the AD7226 when operating from less than +5.5 V.
