Features: ·32-channel DAC in 13 mm × 13 mm 108-lead CSPBGA
·Guaranteed monotonic to 14 bits
·Buffered voltage outputs
Output voltage span of 3.5 V × VREF(+)
·Maximum output voltage span of 17.5 V
·System calibration function allowing user-programmable offset and gain
·Pseudo differential outputs relative to REFGND
·Clear function to user-defined REFGND (CLR pin)
·Simultaneous update of DAC outputs (LDAC pin)
·DAC increment/decrement mode
·Channel grouping and addressing features
·Interface options
Parallel interface
DSP/microcontroller-compatible 3-wire serial interface
·2.5 V to 5.5 V JEDEC-compliant digital levels
·SDO daisy-chaining option
·Power-on reset
·Digital reset (RESET pin and soft reset function)Application·Level setting in automatic test equipment (ATE)
·Variable optical attenuators (VOAs)
·Optical switches
·Industrial control systemsPinout
Specifications
| DAC Input Format |
Par,Ser,SPI |
| # DAC Outputs |
32 |
| Pwr Diss |
850mW |
| DAC Uni or Bip |
Uni/Bip |
| DAC Vout Swing max |
17.5V p-p |
| Output FSR |
User Def. Range/Offset |
| Package |
BGA |
| Resolution (Bits) |
14bit |
| Supply Vnom |
Multi(+12, -12, +5),Multi(±15, +5Dig) |
VDD to AGND...............................−0.3 V to +17 V
VSS to AGND...............................−17 V to +0.3 V
VCC to DGND................................−0.3 V to +7 V
Digital Inputs to DGND......−0.3 V to VCC + 0.3 V
Digital Outputs to DGND...−0.3 V to VCC + 0.3 V
VREF1(+), VREF2(+) to AGND.......−0.3 V to +7 V
VREF1(−), VREF2(−) to AGND..VSS− 0.3 V to VDD + 0.3 V
VBIAS to AGND.............................−0.3 V to +7 V
VOUT0VOUT31 to AGND......VSS − 0.3 V to VDD + 0.3 V
REFGND to AGND..................VSS − 0.3 V to VDD + 0.3 V
AGND to DGND.........................−0.3 V to +0.3 V
Operating Temperature Range (TA)
Industrial (A Version)...........................−40°C to +85°C
Storage Temperature Range.............−65°C to +150°C
Junction Temperature (TJ max)............................150°C
108-Lead CSPBGA Package
JA Thermal Impedance.......................37.5°C/W
JC Thermal Impedance.........................8.5°C/W
Reflow Soldering
Peak Temperature.....................................230°C
Time at Peak Temperature.............10 sec to 40 sec
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Only one absolute maximum rating may be applied at any one time.
DescriptionThe AD5378 is a 32-channel 14-bit bipolar voltage-output DAC. It combines 32 DAC channels and 32 output amplifiers (with gain) in a single package. All DACs are monotonic to 14-bits and accurate to
The AD5378 contains 32 14-bit DACs in one CSPBGA package. The AD5378 provides a bipolar output range determined by the voltages applied to the VREF(+) and VREF(−) inputs. The maximum output voltage span is 17.5 V, corresponding to a bipolar output range of −8.75 V to +8.75 V, and is achieved with reference volt-ages of VREF(−) = −3.5 V and VREF(+) = +5 V.
The AD5378 guarantees operation over a wide VSS/VDD supply range from ±11.4 V to ±16.5 V. The output amplifier headroom requirement is 2.5 V operating with a load current of 1.5 mA, and 2 V operating with a load current of 0.5 mA.
The AD5378 contains a double-buffered parallel interface in which 14 data bits are loaded into one of the input registers under the control of the WR, CS, and DAC channel address pins, A0 to A7. It also has a 3-wire serial interface, which is compatible with SPI®, QSPI™, MICROWIRE™, and DSP inter-face standards and can handle clock speeds of up to 50 MHz.
The DAC outputs are updated when the DAC registers receive new data. All the outputs can be updated simultaneously by taking theLDAC input low. Each channel has a programmable gain and an offset adjust register.
Each DAC AD5378 output is gained and buffered on-chip with respect to an external REFGND input. The DAC outputs can also be switched to REFGND via theCLR pin. Table 1 and Table 2 show the product portfolio for high channel count bipolar and unipolar voltage output DACs.
AD5378 Data Sheet
