LTC2442IG#PBF Linear Technology, LTC2442IG#PBF Datasheet - Page 30

• Manufacturer Part Number: LTC2442IG#PBF
• Description: IC ADC 24BIT 4CH 36-SSOP
• Manufacturer: Linear Technology

Specifications of LTC2442IG#PBF

• Number Of Bits: 24
• Sampling Rate (per Second): 8k
• Data Interface: MICROWIRE™, Serial, SPI™
• Number Of Converters: 1
• Power Dissipation (max): 50mW
• Voltage Supply Source: Single Supply
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-SSOP (0.200", 5.30mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LTC2442
APPLICATIO S I FOR ATIO
The amplifi ers take approximately 50µs to settle for a
full-scale input voltage. This does not affect accuracy in
either 2x mode or 1x mode for OSR values between 256
to 32768. However, the amplifi er settling time will cause
a gain error in 1x mode for OSR values between 64 to
256. This is because the mid-conversion slew time is a
signifi cant portion of the total conversion time. Figure 22
shows the details of a conversion in 1x mode, OSR128,
with a full-scale input voltage applied (V
2.5V). The previously selected channel had both inputs
grounded. On the 13
30
U
Figure 22. Details of Conversion in 1x Mode, OSR128 (OUTA and OUTB Superimposed)
Figure 23. Details of Conversion in 2x Mode, OSR128 (OUTA and OUTB Superimposed)
th
falling clock edge, the amplifi ers
U
OUTB
BUSY
OUTB
BUSY
SCK
SCK
W
CS
CS
IN
= 2.5V, V
U
CM
=
200µs/DIV
200µs/DIV
begin slewing and have reached the correct voltage before
the conversion begins. Midway through the conversion,
the multiplexer reverses the inputs. Figure 23 shows
operation in 2x mode. After the fi rst half-conversion
is done, the multiplexer reverses. Waiting 50µs before
beginning the next half-conversion allows the amplifi ers
to settle fully. 2x mode is recommended for OSR values
between 64 and 128 because the amplifi ers have time to
settle between half conversions. If only the 1x data rate
is required, ignore every other sample.
1V/DIV
5V/DIV
1V/DIV
5V/DIV
2442f