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ADS8504IBDWRG4 View Datasheet(PDF) - Burr-Brown -> Texas Instruments

Part NameDescriptionManufacturer
ADS8504IBDWRG4 12-BIT 250-KSPS SAMPLING CMOS ANALOG-TO-DIGITAL CONVERTER BB
Burr-Brown -> Texas Instruments BB
ADS8504IBDWRG4 Datasheet PDF : 19 Pages
First Prev 11 12 13 14 15 16 17 18 19
ADS8504
SLAS434 – JUNE 2005
tsu
tsu
R/C
CS
BYTE
Pins 6 − 13 Hi−Z
Pins 15 − 18 Hi−Z
High Byte
ten
Low Byte
Low Byte
td4
High Byte
Hi−Z
tdis
Hi−Z
Figure 21. Using CS and BYTE to Control Data Bus
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INPUT RANGES
The ADS8504 offers a standard ±10-V input range. Figure 23 shows the necessary circuit connections for the
ADS8504 with and without hardware trim. Offset and full-scale error specifications are tested and specified with
the fixed resistors shown in Figure 23(b). Full-scale error includes offset and gain errors measured at both +FS
and -FS. Adjustments for offset and gain are described in the Calibration section of this data sheet.
The offset and gain are adjusted internally to allow external trimming with a single supply. The external resistors
compensate for this adjustment and can be left out if the offset and gain are corrected in software (refer to the
Calibration section).
The nominal input impedance of 11.5 kresults from the combination of the internal resistor network shown on
the front page of the product data sheet and the external resistors. The input resistor divider network provides
inherent overvoltage protection assured to at least ±25 V. The 1% resistors used for the external circuitry do not
compromise the accuracy or drift of the converter. They have little influence relative to the internal resistors, and
tighter tolerances are not required.
The input signal must be referenced to AGND1. This will minimize the ground loop problem typical to analog
designs. The analog input should be driven by a low impedance source. A typical driving circuit using OPA627 or
OPA132 is shown in Figure 6.
2.2 mF
+15V
22 pF
GND
Vin
100 nF
2 kW
22 pF
Pin 7 Pin 1
Pin 2
OPA 627
or
O+PA 132
Pin3
Pin 4
2 kW
Pin 6
GND
2.2 mF
100 nF
−15 V
200 W
ADS8504
VIN
33.2 kW
GND
2.2 mF
REF
2.2 mF
GND
AGND1
CAP
AGND2
GND
DGND
GND
Figure 22. Typical Driving Circuitry (±10 V, No Trim)
12
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