Datasheet

ADS7842
SBAS103C
11
www.ti.com
FIGURE 2. Normal Operation, 16 Clocks per Conversion.
CS RD WR BUSY A0 A1 COMMENTS
0X11X
Power-Down Mode
0X10X Wake-Up Mode
means rising edge triggered. X = Don't care.
TABLE III. Truth Table for Power-Down and Wake-Up Modes.
FIGURE 3. Initiating a Conversion.
123
CS
WR
BUSY
RD
A0
A1
CLK
Latching in Address for Next Channel
Conversion
45
678
910111213141516
Sample
DATA VALID
DB0-DB11
DIGITAL OUTPUT
STRAIGHT BINARY
DESCRIPTION ANALOG INPUT BINARY CODE HEX CODE
Least Significant Bit (LSB) 1.2207mV
Full-Scale 4.99878V 1111 1111 1111 FFF
Midscale 2.5V 1000 0000 0000 800
Midscale –1LSB 2.49878V 0111 1111 1111 7FF
Zero Full-Scale 0V 0000 0000 0000 000
TABLE IV. Ideal Input Voltages and Output Codes (V
REF
= 5V).
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
9
t
10
t
CKL
N + 1
(1)
NOTE: (1) Addresses for next conversion (N + 1) latched in with rising edge of current WR (N).
CS
WR
CLK
BUSY
A0, A1