AD5370 Analog Devices, AD5370 Datasheet
AD5370
Specifications of AD5370
Available stocks
Related parts for AD5370
AD5370 Summary of contents
Page 1
... OUTPUT BUFFER AND POWER-DOWN 16 CONTROL DAC 0 OUTPUT BUFFER AND 16 POWER-DOWN DAC 7 CONTROL GROUP 2 TO GROUP 4 SIGGND2 SIGGND3 SIGGND4 ©2008 Analog Devices, Inc. All rights reserved. AD5370 VREF0 VOUT0 VOUT1 VOUT2 VOUT3 VOUT4 VOUT5 VOUT6 VOUT7 SIGGND0 VREF1 VOUT8 VOUT9 VOUT10 VOUT11 VOUT12 ...
Page 2
... AD5370 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 Revision History ............................................................................... 2 General Description ......................................................................... 3 Specifications..................................................................................... 4 Performance Specifications......................................................... 4 AC Characteristics........................................................................ 5 Timing Characteristics ................................................................ 6 Timing Diagrams.......................................................................... 6 Absolute Maximum Ratings............................................................ 9 ESD Caution.................................................................................. 9 Pin Configurations and Function Descriptions ......................... 10 Typical Performance Characteristics ........................................... 12 Terminology .................................................................................... 14 Theory of Operation ...................................................................... 15 DAC Architecture....................................................................... 15 Channel Groups.......................................................................... Registers and Gain/Offset Adjustment ...
Page 3
... V AD5379 14 bits ±8.75 V The AD5370 has a high speed serial interface that is compatible with SPI, QSPI™, MICROWIRE™, and DSP interface standards and can handle clock speeds MHz. The DAC registers are updated on receipt of new data. All the outputs can be updated simultaneously by taking the LDAC input low ...
Page 4
... AD5370 SPECIFICATIONS PERFORMANCE SPECIFICATIONS open circuit; gain (M), offset (C), and DAC offset registers at default values; all specifications T L Table 2. Parameter ACCURACY Resolution Integral Nonlinearity Differential Nonlinearity Zero-Scale Error Full-Scale Error Gain Error 2 Zero-Scale Error 2 Full-Scale Error ...
Page 5
... Power Dissipation Unloaded (P) Power-Down Mode Junction Temperature 1 Temperature range for the AD5370 is −40°C to +85°C. Typical specifications are at 25°C. 2 Guaranteed by design and characterization, not production tested. 3 Where θ represents the package thermal impedance CHARACTERISTICS − ...
Page 6
... AD5370 TIMING CHARACTERISTICS open circuit; gain (M), offset (C), and DAC offset registers at default values; all specifications T L Table 4. SPI Interface Limit MIN MAX Parameter Min Typ Max ...
Page 7
... RESET VOUTx BUSY 1 LDAC ACTIVE DURING BUSY. 2 LDAC ACTIVE AFTER BUSY DB0 Figure 4. SPI Write Timing Rev Page AD5370 ...
Page 8
... AD5370 SCLK SYNC SDI DB23 SDO DB0 DB23 INPUT WORD SPECIFIES REGISTER TO BE READ DB0 DB23 SELECTED REGISTER DATA CLOCKED OUT LSB FROM PREVIOUS WRITE Figure 5. SPI Read Timing Rev Page DB0 NOP CONDITION DB0 ...
Page 9
... 0 −0 0.3 V ESD CAUTION CC −0 +5 − − −0 +0.3 V −40°C to +85°C −65°C to +150°C 130°C 25°C/W 45.5°C/W 230°C 10 sec to 40 sec Rev Page AD5370 ...
Page 10
... Reference Input for DAC 0 to DAC 7. This reference voltage is referred to AGND. Reference Input for DAC 8 to DAC 39. This reference voltage is referred to AGND. Rev Page VOUT5 47 VOUT4 46 SIGGND0 45 VOUT3 44 VOUT2 43 VOUT1 AD5370 VOUT0 42 TOP VIEW (Not to Scale) 41 VREF0 VOUT23 40 VOUT22 39 VOUT21 38 VOUT20 37 ...
Page 11
... Load DAC Logic Input (Active Low). Asynchronous Clear Input (Level Sensitive, Active Low). See the Clear Function section for more information. The lead-free chip scale package (LFCSP) has an exposed paddle on the underside. The paddle should be connected Rev Page AD5370 ...
Page 12
... AD5370 TYPICAL PERFORMANCE CHARACTERISTICS –1 –2 0 16384 32768 DAC CODE Figure 8.Typical INL Plot –0.6 –0.3 0 INL (LSB) Figure 9. Typical INL Distribution –2 – TEMPERATURE (°C) Figure 10. Typical INL Error vs. Temperature –0.01 –0.02 49152 65535 0 ...
Page 13
... TEMPERATURE (°C) Figure 16 vs. Temperature 13. +3. 0. Rev Page AD5370 V = 15V 15V 25°C A 13.25 13.50 13.75 14.00 I (mA) DD Figure 17. Typical I Distribution 25°C A 0.35 0.40 0.45 0.50 I (mA) CC Figure 18. Typical DI ...
Page 14
... AD5370 TERMINOLOGY Integral Nonlinearity (INL) Integral nonlinearity, or endpoint linearity measure of the maximum deviation from a straight line passing through the endpoints of the DAC transfer function measured after adjusting for zero-scale error and full-scale error and is expressed in least significant bits (LSB). ...
Page 15
... A/B Select 4 8 0x00 CHANNEL GROUPS The 40 DAC channels of the AD5370 are arranged into five groups of eight channels. The eight DACs of Group 0 derive their reference voltage from VREF0. Group 1 to Group 4 derive their reference voltage from VREF1. Each group has its own signal ground pin ...
Page 16
... Group 0 or Group 1 to Group unipolar positive, unipolar negative, or bipolar, either symmetrical or asymmetrical about 0 V. The DAC channels in the AD5370 are factory trimmed with the offset DAC channels set at their default values. This results in optimum offset and gain performance for the default output range and span ...
Page 17
... ERROR –4V Figure 22. DAC Transfer Function The output voltage of a DAC in the AD5370 is dependent on the value in the input register, the value of the M and C registers, and the value in the offset DAC. The transfer functions for the AD5370 are shown in the following section. ...
Page 18
... These limitations can be overcome by increasing the reference value. With reference span is achieved. The ideal voltage range for the AD5370 is − Using a 3.1 V reference increases the range to −4.133 V to +8.2667 V. Clearly, in this case, the offset and gain errors are insignificant, and the M and C registers can be used to raise the negative voltage to − ...
Page 19
... To indicate that the AD5370 has entered temperature shutdown mode, Bit 4 of the control register is set to 1. The AD5370 remains in temperature shutdown mode, even if the die temperature falls, until Bit 1 in the control register is cleared to 0. ...
Page 20
... AD5370 TOGGLE MODE The AD5370 has two X2 registers per channel, X2A and X2B, that can be used to switch the DAC output between two levels with ease. This approach greatly reduces the overhead required by a microprocessor that would otherwise have to write to each channel individually. When the user writes to the X1A, X2A register, the calculation engine takes a certain amount of time to calculate the appropriate X2A or X2B value ...
Page 21
... The AD5370 allows data readback via the serial interface from every register directly accessible to the serial interface, which is all registers except the X2A, X2B, and DAC registers. To read back a register first necessary to tell the AD5370 which register to read. This is achieved by writing a word whose Table 10. Serial Word Bit Assignment ...
Page 22
... AD5370 Table 11 shows the groups and channels that are addressed for every combination of Address Bit A5 to Address Bit A0. Table 11. Group and Channel Addressing Address Bit A2 to Address Bit A0 000 000 All groups, all channels 001 Group 0, all channels 010 Group 1, all channels ...
Page 23
... Write data in F7:F0 to A/B Select Register 3. Write data in F7:F0 to A/B Select Register 4. Block write A/B select registers. F7: write all 0s (all channels use X2A register). F7: write all 1s (all channels use X2B register). Rev Page AD5370 ...
Page 24
... AD5370 Table 14. Address Codes for Data Readback F15 F14 F13 F12 Bit F12 to Bit F7 select the channel to be read back from ...
Page 25
... In most applications, this is not an issue because the ground pins for the power supplies are connected to the ground pins of the AD5370 via ground planes. When the AD5370 is used in a hot swap card, care should be taken to ensure that the ground pins are connected to the supply grounds before the positive or negative supply is connected ...
Page 26
... AD5370 INTERFACING EXAMPLES The SPI interface of the AD5370 is designed to allow the parts to be easily connected to industry-standard DSPs and microcontrollers. Figure 23 shows how the AD5370 can be connected to the Analog Devices, Inc., Blackfin® DSP. The Blackfin has an integrated SPI port that can be connected directly to the SPI pins of the ...
Page 27
... Lead Frame Chip Scale Package (LFCSP_VQ) 64-Lead Low Profile Quad Flat Package (LQFP) 64-Lead Low Profile Quad Flat Package (LQFP) Rev Page 0.60 MAX PIN 1 INDICATOR 64 1 7.25 EXPOSED PAD 7.10 SQ (BOTTOM VIEW) 6. 0.25 MIN 7.50 REF 12.20 12.00 SQ 11. 10.20 TOP VIEW 10.00 SQ (PINS DOWN) 9. 0.27 0.22 0.17 Package Option CP-64-3 CP-64-3 ST-64-2 ST-64-2 AD5370 ...
Page 28
... AD5370 NOTES © 2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05813-0-4/08(0) Rev Page ...