MCP3202-BIST Microchip Technology, MCP3202-BIST Datasheet

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MCP3202-BIST

Manufacturer Part Number
MCP3202-BIST
Description
2.7V Dual Channel 12-Bit A/D Converter with SPI Serial Interface
Manufacturer
Microchip Technology
Datasheet
FEATURES
• 12-bit resolution
• ±1 LSB max DNL
• ±1 LSB max INL (MCP3202-B)
• ±2 LSB max INL (MCP3202-C)
• Analog inputs programmable as single-ended or
• On-chip sample and hold
• SPI
• Single supply operation: 2.7V - 5.5V
• 100ksps max. sampling rate at V
• 50ksps max. sampling rate at V
• Low power CMOS technology
• Industrial temp range: -40°C to +85°C
• 8-pin PDIP SOIC and TSSOP packages
APPLICATIONS
• Sensor Interface
• Process Control
• Data Acquisition
• Battery Operated Systems
DESCRIPTION
The Microchip Technology Inc. MCP3202 is a succes-
sive approximation 12-bit Analog-to-Digital (A/D) Con-
verter with on-board sample and hold circuitry. The
MCP3202 is programmable to provide a single
pseudo-differential input pair or dual single-ended
inputs. Differential Nonlinearity (DNL) is specified at
±1 LSB, and Integral Nonlinearity (INL) is offered in
±1 LSB (MCP3202-B) and ±2 LSB (MCP3202-C) ver-
sions. Communication with the device is done using a
simple serial interface compatible with the SPI protocol.
The device is capable of conversion rates of up to
100ksps at 5V and 50ksps at 2.7V. The MCP3202
device operates over a broad voltage range (2.7V -
5.5V). Low current design permits operation with typi-
cal standby and active currents of only 500nA and
375µA, respectively. The MCP3202 is offered in 8-pin
PDIP, TSSOP and 150mil SOIC packages.
1999 Microchip Technology Inc.
pseudo-differential pairs
- 500nA typical standby current, 5µA max.
- 550µA max. active current at 5V
®
serial interface (modes 0,0 and 1,1)
2.7V Dual Channel 12-Bit A/D Converter
with SPI
DD
DD
= 2.7V
= 5V
®
Preliminary
Serial Interface
PACKAGE TYPES
FUNCTIONAL BLOCK DIAGRAM
PDIP
SOIC, TSSOP
CH0
CH1
CS/SHDN
CS/SHDN
Channel
Input
Mux
CH0
CH1
CH0
CH1
MCP3202
Sample
V
V
and
Hold
SS
SS
CS/SHDN
1
2
3
4
1
2
3
4
Control Logic
DAC
Comparator
8
7
6
5
8
7
6
5
D
IN
CLK
V
CLK
D
D
V
CLK
D
D
DD
OUT
IN
DD
OUT
IN
/V
DS21034A-page 1
/V
REF
12-Bit SAR
REF
Register
V
D
Shift
DD
OUT
V
SS

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MCP3202-BIST Summary of contents

Page 1

... Communication with the device is done using a simple serial interface compatible with the SPI protocol. The device is capable of conversion rates 100ksps at 5V and 50ksps at 2.7V. The MCP3202 device operates over a broad voltage range (2.7V - 5.5V). Low current design permits operation with typi- cal standby and active currents of only 500nA and 375µ ...

Page 2

... UNITS CONDITIONS clock cycles clock cycles ksps REF ksps 2.7V DD REF bits LSB MCP3202-B LSB MCP3202-C LSB No missing codes over temperature LSB LSB 0.1V to 4.9V@1kHz 0.1V to 4.9V@1kHz 0.1V to 4.9V@1kHz IN V See Sections 3.1 and 4.1 mV See Sections 3.1 and 4.1 µA ...

Page 3

... LO 10 OUT 1.8 0.9 250 HI 250 LO 100 200 DO 200 EN 100 500 t 100 R t 100 F 2.7 5.5 DD 375 550 DD 0.5 5 Preliminary MCP3202 = 18*f CLK SAMPLE UNITS CONDITIONS -1mA 4. 1mA 4. µ µ OUT 5.0V (Note 1) ...

Page 4

... MCP3202 CS t SUCS CLK MSB OUT FIGURE 1-1: Serial Timing. Load circuit for 1.4V 3K Test Point D OUT C = 100pF L Voltage Waveforms for OUT Voltage Waveforms for t CLK OUT FIGURE 1-2: Test Circuits. DS21034A-page ...

Page 5

... FIGURE 2- 1 2.7V 0 0.6 SAMPLE 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 0 512 1024 1536 2048 2560 3072 3584 4096 FIGURE 2-6: (Representative Part, V Preliminary MCP3202 ,T = 25°C SAMPLE A Positive INL Negative INL 100 Sample Rate (ksps) Integral Nonlinearity (INL) vs. Sample F = 50ksps SAMPLE Positive INL Negative INL 3.0 3.5 4.0 4.5 5.0 V (V) DD Integral Nonlinearity (INL) vs ...

Page 6

... MCP3202 Note: Unless otherwise indicated 1.0 0.8 Positive INL 0.6 0.4 0.2 0.0 Negative INL -0.2 -0.4 -0.6 -0.8 -1.0 -50 - Temperature (°C) FIGURE 2-7: Integral Nonlinearity Temperature. 1.0 0.8 0.6 0.4 Positive DNL 0.2 0.0 -0.2 Negative DNL -0.4 -0.6 -0.8 -1 100 Sample Rate (ksps) FIGURE 2-8: Differential Nonlinearity (DNL) vs. Sample Rate. 1.0 F 0.8 0.6 Positive DNL 0.4 0.2 0.0 -0.2 -0.4 Negative DNL -0.6 -0.8 -1.0 2.5 3.0 3.5 4.0 V (V) DD FIGURE 2-9: Differential Nonlinearity (DNL) vs. V ...

Page 7

... FIGURE 2-17: Differential Nonlinearity (DNL) vs. Temperature (V DD 2.0 1.8 F 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 4.5 5.0 2.5 3.0 FIGURE 2-18: Offset Error vs. V Preliminary MCP3202 ,T = 25°C SAMPLE A 1024 1536 2048 2560 3072 3584 4096 Digital Code = 2.7V). DD Positive DNL Negative DNL 100 Temperature (°C) = 2.7V). = 100ksps SAMPLE F = 50ksps SAMPLE F = 10ksps SAMPLE 3 ...

Page 8

... MCP3202 Note: Unless otherwise indicated 1.0 0.8 0 2. 50ksps SAMPLE 0.2 0.0 -0.2 -0.4 -0 -0.8 F SAMPLE -1.0 -50 - Temperature (°C) FIGURE 2-19: Gain Error vs. Temperature. 100 SAMPLE 2. 50ksps SAMPLE Input Frequency (kHz) FIGURE 2-20: Signal to Noise Ratio (SNR) vs. Input Frequency ...

Page 9

... Ripple Frequency -20 = 100ksps -30 = 9.985kHz -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 40000 50000 0 FIGURE 2-30: Frequency Spectrum of 1kHz input (Representative Part, V Preliminary MCP3202 ,T = 25°C SAMPLE 100ksps SAMPLE 50ksps SAMPLE 10 100 Input Frequency (kHz) 10 100 1000 10000 ...

Page 10

... MCP3202 Note: Unless otherwise indicated 500 All points 1.8MHz except 450 CLK 2.5V 900kHz DD CLK 400 350 300 250 200 150 100 50 0 2.0 2.5 3.0 3.5 4.0 4.5 V (V) DD FIGURE 2-31 500 450 400 350 300 250 V = 2.7V DD 200 150 100 ...

Page 11

... SPI-compatible interface. 1999 Microchip Technology Inc. 4.1 Analog Inputs The MCP3202 device offers the choice of using the ana- log input channels configured as two single-ended inputs or a single pseudo-differential input. Configura- tion is done as part of the serial command before each conversion begins. When used in the psuedo-differen- ...

Page 12

... MCP3202 V CHx PIN VA 7pF Legend VA = Signal Source R = Source Impedance S CHx = Input Channel Pad C = Input Capacitance PIN V = Threshold Voltage Leakage Current at the pin LEAKAGE due to various junctions SS = Sampling Switch R = Sampling Switch Resistor Sample/Hold Capacitance SAMPLE FIGURE 4-1: Analog Input Model. ...

Page 13

... MSB first format. See Figure 5-2. Table 5-1 shows the configuration bits for the MCP3202. The device will begin to sample the analog input on the second rising edge of the clock, after the start bit has been received. The sample period will end on the falling edge of the third clock following the start bit ...

Page 14

... MCP3202 FIGURE 5-1: Communication with the MCP3202 using MSB first format only SUCS CLK D IN HI-Z Null B11 B10 B10 B11 D Bit OUT (MSB) t SAMPLE * After completing the data transfer, if further clocks are applied with CS low, the A/D Converter will output zeros indefinitely. ...

Page 15

... This is usually done by sending ‘leading zeros’ before the start bit, which are ignored by the device example, Figure 6-1 and Figure 6-2 show how the MCP3202 can be interfaced to a MCU with a hardware SPI port. Figure 6-1 depicts the operation shown in SPI Mode 0,0, ...

Page 16

... This is illustrated in Figure 6-3 below where an op amp is used to drive the analog input of the MCP3202. This amplifier provides a low impedance output for the con- verter input and a low pass filter, which eliminates unwanted high frequency noise ...

Page 17

... MCP3202 PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. MCP3202 - Package: Temperature Range: Performance Grade: Device: Sales and Support Data Sheets Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom- mended workarounds ...

Page 18

... MCP3202 NOTES: DS21034A-page 18 Preliminary 1999 Microchip Technology Inc. ...

Page 19

... NOTES: 1999 Microchip Technology Inc. Preliminary MCP3202 DS21034A-page 19 ...

Page 20

... Information contained in this publication regarding device applications and the like is intended for suggestion only and may be superseded by updates. No representation or warranty is given and no liability is assumed by Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip’s products as critical components in life support systems is not authorized except with express written approval by Microchip ...

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