Datasheet
ADS850
SBAS154C
4
www.ti.com
PIN CONFIGURATION
1+V
S
+5V Supply
2+V
S
+5V Supply
3+V
S
+5V Supply
4+V
S
+5V Supply
5 GND Ground
6 I CLK Convert Clock Input
7 NC No Connection
8 I MEM_RST Memory Reset. When pulsed HIGH,
resets memory to zero. Not intended as
a function pin, so should be perma-
nently tied to ground.
9 I CAL When Pulsed High, puts ADC into Cali-
bration Mode (2 clock cycles).
10 OVR Over Range Indicator
11 CAL_BUSY Indicates in Calibration Mode.
12 O B1 (MSB) Data Bit 1 (D13) (MSB)
13 O B2 Data Bit 2 (D12)
14 O B3 Data Bit 3 (D11)
15 O B4 Data Bit 4 (D10)
16 O B5 Data Bit 5 (D9)
17 O B6 Data Bit 6 (D8)
18 O B7 Data Bit 7 (D7)
19 O B8 Data Bit 8 (D6)
20 O B9 Data Bit 9 (D5)
21 O B10 Data Bit 10 (D4)
22 O B11 Data Bit 11 (D3)
23 O B12 Data Bit 12 (D2)
24 O B13 Data Bit 13 (D1)
25 O B14 (LSB) Data Bit 14 (D0) (LSB)
26 VDRV Output Driver Voltage
27 GND Ground
28 I OE Output Enable: HI = High Impedance;
LO = Normal Operation (50kΩ Internal
Pull-Down Resistor)
29 I PD Power Down: HI = Power Down; LO = Normal
Operation (50kΩ Internal Pull-Down Resistor)
30 I BTC HI = Binary Two’s Complement (BTC);
LO = Straight Offset Binary (SOB)
31 GND Ground
32 GND Ground
33 SEL Input Range Select
34 I/O V
REF
Reference Voltage Select
35 GND Ground
36 +V
S
+5V Supply
37 CBP2 Calibration Reference Bypass 2 (0.1µF ce-
ramic capacitor recommended for decou-
pling.)
38 GND Ground
39 I/O REFB Bottom Reference Voltage Bypass
40 O CM Common-Mode Voltage (mid-scale). Not in-
tended for driving a load.
41 I/O REFT Top Reference Voltage Bypass
42 GND Ground
43 CBP1 Calibration Reference Bypass 1 (0.1µF ce-
ramic capacitor recommended for decou-
pling.)
44 GND Ground
45 I IN Complementary Analog Input (–)
46 GND Ground
47 I IN Analog Input (+)
48 GND Ground
PIN I/O DESIGNATOR DESCRIPTION PIN I/O DESIGNATOR DESCRIPTION
PIN DESCRIPTIONS
Top View TQFP
36
35
34
33
32
31
30
29
28
27
26
25
+V
S
GND
V
REF
SEL
GND
GND
BTC
PD
OE
GND
VDRV
B14 (LSB)
GND
IN
GND
IN
GND
CBP1
GND
REFT
CM
REFB
GND
CBP2
B2
B3
B4
B5
B6
B7
B8
B9
B10
B11
B12
B13
1
2
3
4
5
6
7
8
9
10
11
12
+V
S
+V
S
+V
S
+V
S
GND
CLK
NC
MEM_RST
CAL
OVR
CAL_BUSY
B1 (MSB)
48 47 46 45 44 43 42
41 40 39 38
13 14 15 16 17 18 19 20 21 22 23
37
24
ADS850Y