MCP3204-BIP MICROCHIP [Microchip Technology], MCP3204-BIP Datasheet

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MCP3204-BIP

Manufacturer Part Number
MCP3204-BIP
Description
2.7V 4-Channel/8-Channel 12-Bit A/D Converters with SPI Serial Interface
Manufacturer
MICROCHIP [Microchip Technology]
Datasheet
FEATURES
• 12-bit resolution
• ± 1 LSB max DNL
• ± 1 LSB max INL (MCP3204/3208-B)
• ± 2 LSB max INL (MCP3204/3208-C)
• 4 (MCP3204) or 8 (MCP3208) input channels
• 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
• Available in PDIP, SOIC and TSSOP packages
APPLICATIONS
• Sensor Interface
• Process Control
• Data Acquisition
• Battery Operated Systems
DESCRIPTION
The
devices are successive approximation 12-bit Ana-
log-to-Digital (A/D) Converters with on-board sample
and hold circuitry. The MCP3204 is programmable to
provide two pseudo-differential input pairs or four sin-
gle-ended inputs. The MCP3208 is programmable to
provide four pseudo-differential input pairs or eight sin-
gle-ended inputs. Differential Nonlinearity (DNL) is
specified at ±1 LSB, and Integral Nonlinearity (INL) is
offered in ±1 LSB (MCP3204/3208-B) and ±2 LSB
(MCP3204/3208-C) versions. Communication with the
devices is done using a simple serial interface compat-
ible with the SPI protocol. The devices are capable of
conversion rates of up to 100ksps. The MCP3204/3208
devices operate 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
320µA, respectively. The MCP3204 is offered in 14-pin
PDIP, 150mil SOIC and TSSOP packages, and the
MCP3208 is offered in 16-pin PDIP and SOIC pack-
ages.
1999 Microchip Technology Inc.
pseudo differential pairs
- 500 nA typical standby current, 2µA max.
- 400 µA max. active current at 5V
®
Microchip
serial interface (modes 0,0 and 1,1)
2.7V 4-Channel/8-Channel 12-Bit A/D Converters
Technology
Inc.
with SPI
DD
DD
= 2.7V
= 5V
MCP3204/3208
®
Preliminary
Serial Interface
MCP3204/3208
PACKAGE TYPES
FUNCTIONAL BLOCK DIAGRAM
PDIP, SOIC, TSSOP
PDIP, SOIC
CH7*
CH0
CH1
*Note: Channels 5-7 available on MCP3208 Only
Channel
Input
Mux
Sample
Hold
and
DGND
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CS/SHDN
CH0
CH1
CH2
CH3
NC
NC
1
2
3
4
5
6
7
8
Control Logic
1
2
3
4
5
6
7
DAC
V
REF
D
Comparator
IN
16
15
14
13
12
11
10
14
13
12
11
10
9
9
8
CLK
V
V
AGND
CLK
D
D
CS/SHDN
DGND
V
V
AGND
CLK
D
D
CS/SHDN
REF
DD
OUT
IN
REF
DD
OUT
IN
DS21298B-page 1
12-Bit SAR
Register
V
D
Shift
DD
OUT
V
SS

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MCP3204-BIP Summary of contents

Page 1

... Communication with the devices is done using a simple serial interface compat- ible with the SPI protocol. The devices are capable of conversion rates 100ksps. The MCP3204/3208 devices operate 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 320µ ...

Page 2

... SAMPLE MIN. TYP. MAX. UNITS 12 clock cycles 1.5 clock cycles 100 ksps V 50 ksps V 12 bits ±0.75 ±1 LSB MCP3204/3208-B ±1 ±2 MCP3204/3208-C ±0.5 ±1 LSB No missing codes over temperature ±1.25 ±3 LSB ±1.25 ±5 LSB - 0. Note 2 ...

Page 3

... V 320 400 µA 225 0.5 2 µA levels. REF Preliminary MCP3204/3208 = 100ksps and SAMPLE CONDITIONS See Figure 4-1 See Figure 4 -1mA 4. 1mA 4. OUT 5.0V (Note 25° ...

Page 4

... MCP3204/3208 CS t SUCS CLK MSB OUT FIGURE 1-1: Serial Interface Timing. Load circuit for 1.4V 3K Test Point D OUT C = 100pF L Voltage Waveforms for OUT t R Voltage Waveforms for t CLK OUT FIGURE 1-2: Test Circuits. DS21298B-page ...

Page 5

... V (V) REF FIGURE 2-2: Integral Nonlinearity (INL) vs. V 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 0 512 1024 1536 2048 2560 3072 3584 Digital Code FIGURE 2-3: Integral Nonlinearity (INL) vs. Code (Representative Part). 1999 Microchip Technology Inc. MCP3204/3208 = 5V 0V 100ksps, f REF SS SAMPLE CLK 2 2.7V DD REF 1.5 1.0 0.5 0.0 -0.5 -1.0 -1.5 -2 125 150 FIGURE 2-4: Integral Nonlinearity (INL) vs. Sample Rate ( ...

Page 6

... MCP3204/3208 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 -0.4 Negative DNL -0.6 -0.8 -1 100 Sample Rate (ksps) FIGURE 2-8: Differential Nonlinearity (DNL) vs. Sample Rate. 3.0 2.0 1.0 Positive DNL 0.0 Negative DNL -1.0 -2.0 -3 (V) ...

Page 7

... 50ksps SAMPLE 100ksps -2 SAMPLE - (V) REF FIGURE 2-15: Gain Error vs REF 1999 Microchip Technology Inc. MCP3204/3208 = 5V 0V 100ksps, f REF SS SAMPLE CLK 1 2.7V 0.8 DD REF F = 50ksps SAMPLE 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 3584 4096 0 512 FIGURE 2-16: Differential Nonlinearity (DNL) vs. ...

Page 8

... MCP3204/3208 Note: Unless otherwise indicated 0 2.7V 0.0 DD REF F = 50ksps -0.2 SAMPLE -0.4 -0.6 -0.8 -1 -1.2 DD REF F = 100ksps SAMPLE -1.4 -1.6 -1.8 -50 - Temperature (°C) FIGURE 2-19: Gain Error vs. Temperature. 100 SAMPLE 2.7V DD REF 50ksps SAMPLE Input Frequency (kHz) FIGURE 2-20: Signal to Noise (SNR) vs. Input Frequency ...

Page 9

... REF -20 = 100ksps -30 = 9.985kHz -40 -50 -60 -70 -80 -90 -100 -110 -120 -130 0 40000 50000 FIGURE 2-30: Frequency Spectrum of 1kHz input (Representative Part, V Preliminary MCP3204/3208 = 20 25°C CLK SAMPLE REF F = 100ksps SAMPLE 2.7V DD REF F = 50ksps SAMPLE 10 100 Input Frequency (kHz) ...

Page 10

... MCP3204/3208 Note: Unless otherwise indicated 500 REF DD 450 All points 2MHz except CLK 400 2.5V 1MHz REF DD CLK 350 300 250 200 150 100 50 0 2.0 2.5 3.0 3.5 4.0 4.5 V (V) DD FIGURE 2-31 400 350 300 REF 250 200 ...

Page 11

... Temperature (°C) FIGURE 2-38: I vs. Temperature. DDS 1999 Microchip Technology Inc 100ksps, f REF SS SAMPLE 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0 5.0 5.5 6.0 -50 FIGURE 2-39: Analog Input Leakage Current vs. Temperature. 75 100 Preliminary MCP3204/3208 = 20 25°C CLK SAMPLE REF F = 2MHz CLK - 100 Temperature (°C) DS21298B-page 11 ...

Page 12

... Communication with the device is done using a 4-wire SPI-compatible interface. DS21298B-page 12 4.1 Analog Inputs The MCP3204/3208 devices offer the choice of using the analog input channels configured as single-ended inputs or pseudo-differential pairs. The MCP3204 can be configured to provide two pseudo-differential input pairs or four single-ended inputs. the MCP3208 can be configured to provide four pseudo-differential input pairs or eight single-ended inputs ...

Page 13

... Input Resistance (Ohms) FIGURE 4-2: Maximum Clock Frequency vs. Input resistance ( maintain less than a 0.1LSB S deviation in INL from nominal conditions. 1999 Microchip Technology Inc. DD Sampling Switch LEAKAGE 10000 Preliminary MCP3204/3208 = SAMPLE = DAC capacitance = DS21298B-page 13 ...

Page 14

... D1 and D2) are used to select the input channel configuration. Table 5-1 and Table 5-2 show the config- uration bits for the MCP3204 and MCP3208, respec- tively. The device will begin to sample the analog input on the fourth rising edge of the clock after the start bit has been received ...

Page 15

... During this time, the bias circuit and the comparator power down while the reference input becomes a DATA high impedance node, leaving the CLK running to clock out LSB first data or zeroes. FIGURE 5-2: Communication with MCP3204 or MCP3208 in LSB First Format. 1999 Microchip Technology Inc. MCP3204/3208 t CYC Don’ ...

Page 16

... This is usually done by sending ‘leading zeros’ before the start bit example, Figure 6-1 and Figure 6-2 shows how the MCP3204/3208 can be interfaced to a MCU with a hardware SPI port. Figure 6-1 depicts the operation shown in SPI Mode 0,0 which requires that the SCLK from the MCU idles in the ‘ ...

Page 17

... R 3 FIGURE 6-3: The MCP601 Operational Amplifier is used to implement a 2nd order anti-aliasing filter for the signal being converted by the MCP3204. 1999 Microchip Technology Inc. MCP3204/3208 6.4 Layout Considerations When laying out a printed circuit board for use with ana- log components, care should be taken to reduce noise wherever possible ...

Page 18

... MCP3204/3208 6.5 Utilizing the Digital and Analog Ground Pins The MCP3204/3208 devices provide both digital and analog ground connections to provide another means of noise reduction. As shown in Figure 6-5, the analog and digital circuitry is separated internal to the device. This reduces noise from the digital portion of the device being coupled into the analog portion of the device ...

Page 19

... MCP3204 PRODUCT IDENTIFICATION SYSTEMS To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. MCP3204 - Package: Temperature Range: Performance Grade: Device: MCP3208 PRODUCT IDENTIFICATION SYSTEMS To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. MCP3208 - G ...

Page 20

W ORLDWIDE AMERICAS Corporate Office Microchip Technology Inc. 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-786-7200 Fax: 480-786-7277 Technical Support: 480-786-7627 Web Address: http://www.microchip.com Atlanta Microchip Technology Inc. 500 Sugar Mill Road, Suite 200B Atlanta, GA 30350 Tel: 770-640-0034 ...

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