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ADS7861 Datasheet(PDF) 4 Page - Texas Instruments |
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ADS7861 Datasheet(HTML) 4 Page - Texas Instruments |
4 / 33 page ADS7861 4 SBAS110D DGND CH B1+ CH B1– CH B0+ CH B0– CH A1+ CH A1– CH A0+ CH A0– REF IN REF OUT AGND 1 2 3 4 5 6 7 8 9 10 11 12 24 23 22 21 20 19 18 17 16 15 14 13 +V D SERIAL DATA A SERIAL DATA B BUSY CLOCK CS RD CONVST A0 M0 M1 +V A ADS7861 PIN CONFIGURATIONS Top View SSOP Top View QFN SSOP QFN PIN PIN NAME DESCRIPTION 1 28 DGND Digital Ground. Connect directly to analog ground (pin 12). 2 1 CH B1+ Noninverting Input Channel B1 3 2 CH B1– Inverting Input Channel B1 4 3 CH B0+ Noninverting Input Channel B0 5 4 CH B0– Inverting Input Channel B0 6 5 CH A1+ Noninverting Input Channel A1 7 6 CH A1– Inverting Input Channel A1 8 7 CH A0+ Noninverting Input Channel A0 9 8 CH A0– Inverting Input Channel A0 10 9 REFIN Reference Input 11 10 REFOUT 2.5V Reference Output 12 12 AGND Analog Ground. Connect directly to digital ground (pin 1). 13 13 +VA Analog Power Supply, +5VDC. Connect directly to digital power supply (pin 24). Decouple to analog ground with a 0.1 µF ceramic capacitor and a 10 µF tantalum capacitor. 14 16 M1 Selects between the Serial Outputs. When M1 is LOW, both Serial Output A and Serial Output B are selected for data transfer. When M1 is HIGH, Serial output A is configured for both Channel A data and Channel B data; Serial Output B goes into tri-state (i.e., high impedance). 15 17 M0 Selects between two-channel and four-channel operation. When M0 is LOW, two-channel operation is selected and operates in conjunction with A0. When A0 is HIGH, Channel A1 and Channel B1 are being converted. When A0 is LOW, Channel A0 and Channel B0 are being converted. When M0 is HIGH, four-channel operation is selected. In this mode, all four channels are converted in sequence starting with Channels A0 and B0, followed by Channels A1 and B1. 16 18 A0 A0 operates in conjunction with M0. With M0 LOW and A0 HIGH, Channel A1 and Channel B1 are converted. With M0 LOW and A0 LOW, Channel A0 and Channel B0 are converted. 17 19 CONVST Convert Start. When CONVST switches from LOW to HIGH, the device switches from the sample to hold mode, independent of the status of the external clock. 18 20 RD Synchronization Pulse for the Serial Output. 19 21 CS Chip Select. When LOW, the Serial Output A and Serial Output B outputs are active; when HIGH, the serial outputs are tri-stated. 20 22 CLOCK An external CMOS-compatible clock can be applied to the CLOCK input to synchronize the conversion process to an external source. The CLOCK pin controls the sampling rate by the equation: CLOCK = 16 • fSAMPLE. 21 23 BUSY BUSY goes HIGH during a conversion and returns LOW after the third LSB has been transmitted on either the Serial A or Serial B output pin. 22 24 SERIAL The Serial Output data word is comprised of channel information and 12 bits of data. In operation, data is valid on the falling edge of DCLOCK for 16 edges after the rising edge of RD. 23 25 SERIAL The Serial Output data word is comprised of channel information and 12 bits of data. In operation, data is valid on the falling edge of DCLOCK for 16 edges after the rising edge of RD. When M1 is HIGH, both Channel A data and Channel B data are available. 24 27 +VD Digital Power Supply, +5VDC. Connect directly to pin 13. Must be ≤ +V A. PIN DESCRIPTIONS DATA A DATA B CH B1+ CH B1 − CH B0+ CH B0 − CH A1+ CH A1 − CH A0+ CH A0 − SERIAL DATA B BUSY CLOCK CS RD CONVST A0 M0 1 2 3 4 5 6 7 8 24 23 22 21 20 19 18 17 ADS7861(1) NOTE: (1) The thermal pad is internally connected to the substrate. This pad can be connected to the analog ground or left floating. Keep the thermal pad separate from the digital ground, if possible. (2) NC = Not Connected. |
Número de pieza similar - ADS7861_14 |
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Descripción similar - ADS7861_14 |
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