Datasheet AD7874 (Analog Devices) - 6

FabricanteAnalog Devices
Descripción4-channel Simultaneous Sampling, 12-Bit Data Acquisition System
Páginas / Página17 / 6 — AD7874. PIN FUNCTION DESCRIPTION. Pin. Mnemonic. Description. ORDERING …
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AD7874. PIN FUNCTION DESCRIPTION. Pin. Mnemonic. Description. ORDERING GUIDE. Relative Temperature. SNR. Accuracy. Package. Model1. Range

AD7874 PIN FUNCTION DESCRIPTION Pin Mnemonic Description ORDERING GUIDE Relative Temperature SNR Accuracy Package Model1 Range

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AD7874 PIN FUNCTION DESCRIPTION Pin Mnemonic Description
1 VIN1 Analog Input Channel 1. This is the first of the four input channels to be converted in a con- version cycle. Analog input voltage range is ± 10 V. 2 VIN2 Analog Input Channel 2. Analog input voltage range is ± 10 V. 3 VDD Positive supply voltage, +5 V ± 5%. This pin should be decoupled to AGND. 4 INT Interrupt. Active low logic output indicating converter status. See Figure 7. 5 CONVST Convert Start. Logic Input. A low to high transition on this input puts the track/hold into its hold mode and starts conversion. The four channels are converted sequentially, Channel 1 to Channel 4. The CONVST input is asynchronous to CLK and independent of CS and RD. 6 RD Read. Active low logic input. This input is used in conjunction with CS low to enable the data outputs. Four successive reads after a conversion will read the data from the four chan- nels in the sequence, Channel 1, 2, 3, 4. 7 CS Chip Select. Active low logic input. The device is selected when this input is active. 8 CLK Clock Input. An external TTL-compatible clock may be applied to this input pin. Alterna- tively, tying this pin to VSS enables the internal laser trimmed clock oscillator. 9 VDD Positive Supply Voltage, +5 V ± 5%. Same as Pin 3; both pins must be tied together at the package. This pin should be decoupled to DGND. 10 DB11 Data Bit 11 (MSB). Three-state TTL output. Output coding is 2s complement. 11–13 DB10–DB8 Data Bit 10 to Data Bit 8. Three-state TTL outputs. 14 DGND Digital Ground. Ground reference for digital circuitry. 15–21 DB7–DB1 Data Bit 7 to Data Bit 1. Three-state TTL outputs. 22 DB0 Data Bit 0 (LSB). Three-state TTL output. 23 AGND Analog Ground. Ground reference for track/hold, reference and DAC. 24 REF IN Voltage Reference Input. The reference voltage for the part is applied to this pin. It is inter- nally buffered, requiring an input current of only ± 1 µA. The nominal reference voltage for correct operation of the AD7874 is 3 V. 25 REF OUT Voltage Reference Output. The internal 3 V analog reference is provided at this pin. To oper- ate the AD7874 with internal reference, REF OUT is connected to REF IN. The external load capability of the reference is 500 µA. 26 VSS Negative Supply Voltage, –5 V ± 5%. 27 VIN3 Analog Input Channel 3. Analog input voltage range is ± 10 V. 28 VIN4 Analog Input Channel 4. Analog input voltage range is ± 10 V.
ORDERING GUIDE Relative Temperature SNR Accuracy Package Model1 Range (dBs) (LSB) Option2
AD7874AN –40°C to +85°C 70 min ±1 max N-28 AD7874BN –40°C to +85°C 72 min ±1/2 max N-28 AD7874AR –40°C to +85°C 70 min ±1 max R-28 AD7874BR –40°C to +85°C 72 min ±1/2 max R-28 AD7874AQ –40°C to +85°C 70 min ±1 max Q-28 AD7874BQ –40°C to +85°C 72 min ±1/2 max Q-28 AD7874SQ3 –55°C to +125°C 70 min ±1 max Q-28 AD7874SE3 –55°C to +125°C 70 min ±1 max E-28A NOTES 1To order MIL-STD-883, Class B processed parts, add /883B to part number. Contact 1our local sales office for military data sheet and availability. 2E = Leaded Ceramic Chip Carrier; N = Plastic DIP; Q = Cerdip; R = SOIC. 3Available to /883B processing only. REV. C –5–