Overview
The AD7568BPZ-REEL, produced by Analog Devices Inc., is a highly integrated digital-to-analog converter (DAC) that features eight 12-bit DACs in a single monolithic device. Each DAC is a standard current output type with separate VREF, IOUT1, IOUT2, and RFB terminals, making the device extremely versatile and suitable for various configurations. The AD7568 is a serial input device, with data loaded using FSIN, CLKIN, and SDIN, and it includes an address pin (A0) for simplifying device loading in multi-DAC environments. All DACs can be simultaneously updated using the asynchronous LDAC input and cleared by asserting the asynchronous CLR input. The device is available in space-saving 44-pin plastic quad flatpack and 44-lead PLCC packages.
Key Specifications
| Parameter | Value | Units | Test Conditions/Comments |
|---|---|---|---|
| Resolution | 12-bit | - | - |
| Output Type | Current Output | - | - |
| VREF Input Resistance | 5 kΩ min, 7 kΩ typ, 9 kΩ max | Ω | - |
| Ladder Resistance Mismatch | 2% max, 0.6% typ | % | - |
| VINH, Input High Voltage | 2.4 V min | V | - |
| VINL, Input Low Voltage | 0.8 V max | V | - |
| IINH, Input Current | ±1 µA max | A | - |
| CIN, Input Capacitance | 10 pF max | F | - |
| VDD Range | 4.75/5.25 V min/max | V | - |
| Power Supply Sensitivity | -75 dB typ | dB | - |
| IDD | 300 µA max (VINH = 4.0 V, VINL = 0.4 V) | A | - |
| Output Voltage Settling Time | 500 ns typ | ns | - |
| Gain Temperature Coefficient | 5 ppm/°C max, 2 ppm/°C typ | ppm/°C | - |
Key Features
- Eight 12-bit DACs in a single monolithic device, each with separate VREF, IOUT1, IOUT2, and RFB terminals.
- Serial input interface using FSIN, CLKIN, and SDIN, with an address pin (A0) for multi-DAC environments.
- Asynchronous LDAC input for simultaneous updating of all DACs and asynchronous CLR input for clearing all DACs.
- Space-saving 44-pin plastic quad flatpack and 44-lead PLCC packages.
- Low power consumption with a maximum IDD of 300 µA (VINH = 4.0 V, VINL = 0.4 V).
- High accuracy with a gain temperature coefficient of 2 ppm/°C typ and 5 ppm/°C max.
Applications
- The AD7568 is suitable for various applications requiring multiple DACs, such as industrial control systems, medical devices, and automotive systems.
- It can be used in circuits requiring adjustable resistances, such as active filters (e.g., high pass, bandpass) where the DAC equivalent resistances are used as circuit elements.
- It is also applicable in systems needing precise voltage or current control, such as in test and measurement equipment and data acquisition systems.
Q & A
- What is the resolution of the AD7568 DACs?
The AD7568 features eight 12-bit DACs.
- What types of packages are available for the AD7568?
The AD7568 is available in 44-pin plastic quad flatpack and 44-lead PLCC packages.
- How are the DACs updated and cleared in the AD7568?
All DACs can be simultaneously updated using the asynchronous LDAC input and cleared by asserting the asynchronous CLR input.
- What is the typical gain temperature coefficient of the AD7568?
The typical gain temperature coefficient is 2 ppm/°C, with a maximum of 5 ppm/°C.
- What is the maximum output leakage current of the AD7568 at +25°C?
The maximum output leakage current at +25°C is 10 nA.
- How does the AD7568 handle input data?
Data is loaded using FSIN, CLKIN, and SDIN, with an address pin (A0) for multi-DAC environments.
- What is the recommended amplifier input offset voltage (VOS) for maintaining specified accuracy?
The recommended VOS should be no greater than 500 µV or (50 × 10–6) × (VREF) over the temperature range of operation.
- What are some suitable amplifiers for use with the AD7568?
Suitable amplifiers include the AD OP07, AD OP27, OP177, AD711, AD845, or multiple versions of these.
- What is the typical output voltage settling time of the AD7568?
The typical output voltage settling time is 500 ns.
- What is the power supply sensitivity of the AD7568?
The power supply sensitivity is -75 dB typ.
