ISL26134AVZ-T7A Intersil, ISL26134AVZ-T7A Datasheet - Page 17

• 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

Standby Mode Operation
The ADC can be put into standby mode to save power. Standby
mode reduces the power to all circuits in the device except the
crystal oscillator amplifier. To enter the standby mode, take the
SCLK signal high and hold it high after SDO/RDY falls. The
converter will remain in standby mode as long as SCLK is held
high. To return to normal operation, take SCLK back low and wait
for the SDO/RDY to fall to indicate that a new conversion has
completed. Figure 33 and Table 12 illustrate the details of
standby mode.
Supply currents are equal in Standby and Power-down modes
unless a Crystal is used. If the Crystal is used, the Crystal
amplifier is turned ON, even in the standby mode.
PARAMETER
PARAMETER
t
t
t
10
11
9
t
12
SDO/RDY
SCLK
SDO/RDY falling edge
Standby Mode Delay
SCLK High after
after SCLK Low
SDO/RDY Low
DESCRIPTION
SDO/RDY Low after
17
DESCRIPTION
SCLK Low
1
23
FIGURE 34. OFFSET CALIBRATION WAVEFORMS AFTER STANDBY
22
TABLE 13. OFFSET CALIBRATION TIMING AFTER STANDY
21
21
ISL26132, ISL26134
t
10
TABLE 12. STANDBY MODE TIMING
SPEED = 1
SPEED = 0
SPEED = 1
SPEED = 0
SPEED = 1
SPEED = 0
SPEED = 1
SPEED = 0
24
0
25
Performing Offset Calibration After Standby
Mode
To perform an offset calibration automatically upon returning
from standby, deliver 2 or more additional SCLKs following a
data read cycle, and then set and hold SCLK high. The device will
remain in Standby as long as SCLK remains high. A calibration
cycle will begin once SCLK is brought low again to resume
normal operation. Additional time will be required to perform the
calibration after returning from Standby. Figure 34 and Table 13
illustrate the details of performing offset calibration after
standby mode.
STANDBY MODE
12.5
MIN
100
400
50
0
0
108
808
MIN
CALIBRATION
BEGIN
DATA READY AFTER CALIBRATION
t
12
12.44
99.94
MAX
410
60
MAX
113
813
23
September 9, 2011
UNITS
UNITS
ms
ms
ms
FN6954.1