CS5102A-BLZ Cirrus Logic Inc, CS5102A-BLZ Datasheet - Page 16

• Manufacturer Part Number: CS5102A-BLZ
• Description: IC ADC 16BIT 100/20KHZ 28-PLCC
• Manufacturer: Cirrus Logic Inc

Specifications of CS5102A-BLZ

• Number Of Bits: 16
• Sampling Rate (per Second): 20k
• Data Interface: Serial
• Number Of Converters: 1
• Power Dissipation (max): 65mW
• Voltage Supply Source: Analog and Digital, Dual ±
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 28-PLCC
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 598-1079-5

16
3.1
The ability of the CS5101A or the CS5102A to con-
vert accurately to 16-bits clearly depends on the
accuracy of its comparator and DAC. Each device
utilizes an “auto-zeroing” scheme to null errors in-
troduced by the comparator. All offsets are stored
on the capacitor array while in the track mode and
are effectively subtracted from the input signal
when a conversion is initiated. Auto-zeroing en-
hances power supply rejection at frequencies well
below the conversion rate.
To achieve 16-bit accuracy from the DAC, the
CS5101A and CS5102A use a novel self-calibra-
Calibration
tion scheme. Each bit capacitor shown in Figure 3
actually consists of several capacitors in parallel
which can be manipulated to adjust the overall bit
weight. An on-chip microcontroller precisely ad-
justs each capacitor with a resolution of 18 bits.
The CS5101A and CS5102A should be reset upon
power-up, thus initiating a calibration cycle. The
device then stores its calibration coefficients in on-
chip SRAM. When the CS5101A and CS5102A are
in power-down mode (SLEEP low), they retain the
calibration coefficients in memory, and need not be
recalibrated when normal operation is resumed.
CS5101A CS5102A
DS45F6