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AD7654 Datasheet(PDF) 8 Page - Analog Devices |
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AD7654 Datasheet(HTML) 8 Page - Analog Devices |
8 / 28 page AD7674 Rev. A | Page 8 of 28 PIN CONFIGURATION AND FUNCTION DESCRIPTIONS 1 2 3 4 5 6 7 8 9 10 11 12 AGND AVDD MODE0 MODE1 D0/OB/2C WARP IMPULSE D1/A0 D2/A1 D3 D4/DIVSCLK[0] D5/DIVSCLK[1] NOTES 1. NC = NO CONNECT. 2. THE EXPOSED PAD IS INTERNALLY CONNECTED TO AGND. THIS CONNECTION IS NOT REQUIRED TO MEET THE ELECTRICAL PERFORMANCES HOWEVER, FOR INCREASED RELIABILITY OF THE SOLDER JOINTS, IT IS RECOMMENDED THAT THE PAD BE SOLDERED TO THE ANALOG GROUND OF THE SYSTEM. CNVST PD RESET CS RD DGND BUSY D17 D16 D15 D14 35 AGND 36 34 33 32 31 30 29 28 27 26 25 AD7674 TOP VIEW (Not to Scale) PIN 1 INDICATOR Figure 4. 48-Lead LQFP and 48-Lead LFCSP (ST-48 and CP-48) Table 6. Pin Function Descriptions Pin No. Mnemonic Type1 Description 1, 44 AGND P Analog Power Ground Pin. 2, 47 AVDD P Input Analog Power Pins. Nominally 5 V. 3 MODE0 DI Data Output Interface Mode Selection. 4 MODE1 DI Data Output Interface Mode Selection: Interface MODE # MODE1 MODE0 Description 0 0 0 18-Bit Interface 1 0 1 16-Bit Interface 2 1 0 Byte Interface 3 1 1 Serial Interface 5 D0/OB/2C DI/O When MODE = 0 (18-bit interface mode), this pin is Bit 0 of the parallel port data output bus and the data coding is straight binary. In all other modes, this pin allows choice of straight binary/binary twos complement. When OB/2C is HIGH, the digital output is straight binary; when LOW, the MSB is inverted, resulting in a twos complement output from its internal shift register. 6 WARP DI Conversion Mode Selection. When this input is HIGH and the IMPULSE pin is LOW, WARP selects the fastest mode, the maximum throughput is achievable, and a minimum conversion rate must be applied in order to guarantee full specified accuracy. When LOW, full accuracy is maintained independent of the minimum conversion rate. 7 IMPULSE DI Conversion Mode Selection. When this input is HIGH and the WARP pin is LOW, IMPULSE selects a reduced power mode. In this mode, the power dissipation is approximately proportional to the sampling rate. When WARP and IMPULSE pins are LOW, the NORMAL mode is selected. 8 D1/A0 DI/O When MODE = 0 (18-bit interface mode), this pin is Bit 1 of the parallel port data output bus. In all other modes, this input pin controls the form in which data is output, as shown in Table 7. |
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