hi7191 Intersil Corporation, hi7191 Datasheet - Page 7

• Manufacturer Part Number: hi7191
• Description: 24-bit, High Precision, Sigma Delta A/d Converter
• Manufacturer: Intersil Corporation

Pin Descriptions
Load Test Circuit
ESD Test Circuits
DIP, SOIC
20 LEAD
V
10
12
13
14
15
16
17
18
19
20
11
1
2
3
4
5
6
7
8
9
±
R
PIN NAME
1
RESET
DGND
AGND
MODE
DRDY
V
SYNC
SCLK
DV
OSC
OSC
SDIO
AV
V
V
AV
SDO
V
V
INLO
CS
RLO
INHI
RHI
CM
SS
DD
DD
2
1
C
Serial Interface Clock. Synchronizes serial data transfers. Data is input on the rising edge and output on the
falling edge.
Serial Data OUT. Serial data is read from this line when using a 3-wire serial protocol such as the
Motorola Serial Peripheral Interface.
Serial Data IN or OUT. This line is bidirectional programmable and interfaces directly to the Intel Standard Serial
Interface using a 2-wire serial protocol.
Chip Select Input. Used to select the HI7191 for a serial data transfer cycle. This line can be tied to DGND.
An Active Low Interrupt indicating that a new data word is available for reading.
Digital Supply Ground.
Negative Analog Power Supply (-5V).
External Reference Input. Should be negative referenced to V
External Reference Input. Should be positive referenced to V
Common Mode Input. Should be set to halfway between AV
Analog Input LO. Negative input of the PGIA.
Analog Input HI. Positive input of the PGIA. The V
condition of an external transducer. This current source is controlled via the Control Register.
Positive Analog Power Supply (+5V).
Analog Supply Ground.
Positive Digital Supply (+5V).
Used to connect a crystal source between OSC
Oscillator Clock Input for the device. A crystal connected between OSC
or an external oscillator can drive OSC
Active Low Reset Pin. Used to initialize the HI7191 registers, filter and state machines.
Active Low Sync Input. Used to control the synchronization of a number of HI7191s. A logic ‘0’ initializes the converter.
Mode Pin. Used to select between Synchronous Self Clocking (Mode = 1) or Synchronous External Clocking
(Mode = 0) for the Serial Port.
FIGURE 5A.
ESD
R
2
7
DUT
HUMAN BODY
C
R
R
MACHINE MODEL
C
R
R
ESD
1
2
ESD
1
2
= 10MΩ
= 1.5kΩ
= 10MΩ
= 0Ω
DUT
= 100pF
= 200pF
HI7191
FIGURE 4.
FIGURE 5.
V
1
1
. The oscillator frequency should be 10MHz (Typ).
R
C
1
L
(INCLUDES STRAY
CAPACITANCE)
INHI
1
and OSC
DESCRIPTION
V
input is connected to a current source that can be used to check the
±
2
R
DD
. Leave open otherwise.
1
RLO
R
RHI
2
and AV
.
.
SS
1
DIELECTRIC
and OSC
.
DUT
FIGURE 5B.
2
will provide a clock to the device,
CHARGED DEVICE MODEL
R
R
1
2
= 1GΩ
= 1Ω
June 1, 2006
FN4138.8