ISL26134AVZ-T7A Intersil, ISL26134AVZ-T7A Datasheet - Page 16

• Manufacturer Part Number: ISL26134AVZ-T7A
• Description: Analog to Digital Converters - ADC ISL26134AVZ LW-NOISE 24BIT DELTASIGMA ADC
• Manufacturer: Intersil

Specifications of ISL26134AVZ-T7A

• Product Category: Analog to Digital Converters - ADC
• Rohs: yes
• Number Of Channels: 4
• Architecture: Sigma-Delta
• Conversion Rate: 80 sps
• Resolution: 24 bit
• Input Type: Differential
• Snr: No
• Interface Type: Serial (2-Wire)
• Operating Supply Voltage: 5 V
• Maximum Operating Temperature: + 105 C
• Package / Case: TSSOP-28
• Maximum Power Dissipation: 68 mW
• Minimum Operating Temperature: - 40 C
• Number Of Converters: 1
• Voltage Reference: External

Offset Calibration Control
The offset internal to the ADC can be removed by performing an
offset calibration operation. Offset calibration can be initiated
immediately after reading a conversion word with 24 SCLKs by
issuing two additional SCLKs. The offset calibration operation will
begin immediately after the 26th SCLK occurs. Figure 32
illustrates the timing details for the offset calibration operation.
During offset calibration, the analog inputs are shorted internally
and a regular conversion is performed. This conversion generates
a conversion word that represents the offset error. This value is
PARAMETER
SDO/RDY
t
t
t
t
t
t
2
3
4
5
6
7
SCLK
SDO/RDY
SDO/RDY
SCLK
SCLK
Conversion Period
16
1
23
SCLK pulsewidth, Low or High
Data Hold after SCLK High
SDO/RDY Low to first SLK
SCLK High to Data Valid
FIGURE 31. OUTPUT DATA WAVEFORMS FOR SDO/RDY POLLING
Register Update Time
22
DATA READY
DESCRIPTION
t
1
9
21
23
FIGURE 32. OFFSET CALIBRATION WAVEFORMS
TABLE 10. INTERFACE TIMING CHARACTERISTICS
FIGURE 33. STANDBY MODE WAVEFORMS
ISL26132, ISL26134
22
t
10
SPEED = 1
SPEED = 0
1
23
21
24
22
0
21
DATA
stored and used to digitally remove the offset error from future
conversion words. The SDO/RDY output will fall to indicate the
completion of the offset calibration operation.
24
PARAMETER
0
CALIBRATION BEGINS
MIN
100
39
STANDBY MODE
0
0
t
25
8
TABLE 11. SDO/RDY DELAY AFTER CALIBRATION
26
24
DATA READY AFTER CALIBRATION
0
SPEED = 1
SPEED = 0
12.5
TYP
100
25
CONVERSION
START
t
8
t
11
25TH SCLK FORCES
DATA READY
SDO/RDY HIGH
MIN
108
808
NEW DATA READY
MAX
50
MAX
109
809
23
23
September 9, 2011
UNITS
ms
ms
ns
ns
ns
µs
ns
FN6954.1
UNITS
ms
ms