MCP6S2X

Manufacturer Part NumberMCP6S2X
DescriptionMCP6S21-2-6-8
ManufacturerN/A
MCP6S2X datasheet
 


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M
Single-Ended, Rail-to-Rail I/O, Low Gain PGA
Features
• Multiplexed Inputs: 1, 2, 6 or 8 channels
• 8 Gain Selections:
- +1, +2, +4, +5, +8, +10, +16 or +32 V/V
• Serial Peripheral Interface (SPI™)
• Rail-to-Rail Input and Output
• Low Gain Error: ±1% (max)
• Low Offset: ±275 µV (max)
• High Bandwidth: 2 to 12 MHz (typ)
• Low Noise: 10 nV/ Hz @ 10 kHz (typ)
• Low Supply Current: 1.0 mA (typ)
• Single Supply: 2.5V to 5.5V
Typical Applications
• A/D Converter Driver
• Multiplexed Analog Applications
• Data Acquisition
• Industrial Instrumentation
• Test Equipment
• Medical Instrumentation
Package Types
MCP6S21
MCP6S22
PDIP, SOIC, MSOP
PDIP, SOIC, MSOP
V
V
V
1
8
1
OUT
DD
OUT
CH0
2
7
SCK
CH0
2
V
3
SI
CH1
3
6
REF
V
V
4
5
4
CS
SS
SS
MCP6S26
MCP6S28
PDIP, SOIC, TSSOP
PDIP, SOIC
V
V
V
1
14
1
OUT
DD
OUT
CH0
2
13
SCK
CH0
2
CH1
3
12
SO
CH1
3
4
CH2
4
11
SI
CH2
CH3
5
10
CS
CH3
5
V
CH4
6
9
CH4
6
SS
V
CH5
7
8
CH5
7
REF
CH6
8
2003 Microchip Technology Inc.
MCP6S21/2/6/8
Description
The Microchip Technology Inc. MCP6S21/2/6/8 are
analog Programmable Gain Amplifiers (PGA). They
can be configured for gains from +1 V/V to +32 V/V and
the input multiplexer can select one of up to eight chan-
nels through an SPI port. The serial interface can also
put the PGA into shutdown to conserve power. These
PGAs are optimized for high speed, low offset voltage
and single-supply operation with rail-to-rail input and
output capability. These specifications support single
supply applications needing flexible performance or
multiple inputs.
The one channel MCP6S21 and the two channel
MCP6S22 are available in 8-pin PDIP, SOIC and
MSOP packages. The six channel MCP6S26 is avail-
able in 14-pin PDIP, SOIC and TSSOP packages. The
eight channel MCP6S28 is available in 16-pin PDIP
and SOIC packages. All parts are fully specified from
-40°C to +85°C.
Block Diagram
CH0
CH1
CH2
CH3
MUX
CH4
CH5
V
8
DD
CH6
7
SCK
CH7
6
SI
CS
5
CS
SI
SPI™
SO
Logic
SCK
POR
V
16
V
DD
15
SCK
14
SO
13 SI
12
CS
V
11
SS
V
10
REF
9
CH7
V
DD
+
V
OUT
-
R
F
8
Gain
Switches
R
G
V
REF
SS
DS21117A-page 1

MCP6S2X Summary of contents

  • Page 1

    M Single-Ended, Rail-to-Rail I/O, Low Gain PGA Features • Multiplexed Inputs channels • 8 Gain Selections: - +1, +2, +4, +5, +8, +10, +16 or +32 V/V • Serial Peripheral Interface (SPI™) • Rail-to-Rail Input ...

  • Page 2

    MCP6S21/2/6/8 1.0 ELECTRICAL CHARACTERISTICS Absolute Maximum Ratings † .........................................................................7. All inputs and outputs....................... Difference Input voltage ........................................ |V Output Short Circuit Current...................................continuous Current at Input Pin Current at Output ...

  • Page 3

    DC CHARACTERISTICS (CONTINUED) Electrical Specifications: Unless otherwise indicated, T Input = CH0 = (0.3V)/G, CH1 to CH7 = 0.3V, R Parameters Sym Power Supply Supply Voltage V DD Quiescent Current I Q Quiescent Current, Shutdown I Q_SHDN mode Power-On Reset ...

  • Page 4

    MCP6S21/2/6/8 DIGITAL CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, T Input = CH0 = (0.3V)/G, CH1 to CH7 = 0.3V, R Parameters SPI Inputs (CS, SI, SCK) Logic Threshold, Low Input Leakage Current Logic Threshold, High Amplifier Output Leakage Current SPI ...

  • Page 5

    TEMPERATURE CHARACTERISTICS Electrical Specifications: Unless otherwise indicated, V Parameters Temperature Ranges Specified Temperature Range Operating Temperature Range Storage Temperature Range Thermal Package Resistances Thermal Resistance, 8L-PDIP Thermal Resistance, 8L-SOIC Thermal Resistance, 8L-MSOP Thermal Resistance, 14L-PDIP Thermal Resistance, 14L-SOIC Thermal Resistance, ...

  • Page 6

    MCP6S21/2/6 CSSC SCK (first 16 bits out are always zeros) FIGURE 1-5: Detailed SPI Serial Interface Timing, SPI 0,0 mode CSSC SCK (first 16 ...

  • Page 7

    DC Output Voltage Specs / Model 1.1.1 IDEAL MODEL The ideal PGA output voltage (V ) is: OUT EQUATION O_ideal IN REF where the nominal gain (see Figure 1-7). This equation holds when ...

  • Page 8

    MCP6S21/2/6/8 1.1.4 DIFFERENT V CONDITIONS REF Some of the plots in Section 2.0, “Typical Performance Curves”, have the conditions V REF The equations and figures above are eas- REF DD ily modified for these conditions. The ...

  • Page 9

    TYPICAL PERFORMANCE CURVES Note: The graphs and tables provided following this note are a statistical summary based on a limited number of samples and are provided for informational purposes only. The performance characteristics listed herein are not tested or ...

  • Page 10

    MCP6S21/2/6/8 Note: Unless otherwise indicated +25° Input = CH0 = (0.3V)/G, CH1 to CH7 = 0.3V, R 200 150 100 +2.5 DD -50 -100 V = +5.5 DD -150 ...

  • Page 11

    Note: Unless otherwise indicated +25° Input = CH0 = (0.3V)/G, CH1 to CH7 = 0.3V, R 120 110 100 -50 - Ambient Temperature (°C) FIGURE 2-13: PSRR vs. Ambient Temperature. ...

  • Page 12

    MCP6S21/2/6/8 Note: Unless otherwise indicated +25° Input = CH0 = (0.3V)/G, CH1 to CH7 = 0. ...

  • Page 13

    Note: Unless otherwise indicated +25° Input = CH0 = (0.3V)/G, CH1 to CH7 = 0.3V Measurement kHz OUT ...

  • Page 14

    MCP6S21/2/6/8 Note: Unless otherwise indicated +25° Input = CH0 = (0.3V)/G, CH1 to CH7 = 0.3V, R 1.0 Shutdown 0.9 0.8 0.7 0.6 CS 0.5 0.4 0.3 0 "ON" OUT 0.1 (CH0 = 0.3V, ...

  • Page 15

    PIN DESCRIPTIONS The descriptions of the pins are listed in Table 3-1. TABLE 3-1: PIN FUNCTION TABLE MCP6S21 MCP6S22 MCP6S26 — — — 4 — — 5 — — 6 — ...

  • Page 16

    MCP6S21/2/6/8 4.0 ANALOG FUNCTIONS The MCP6S21/2/6/8 family of Programmable Gain Amplifiers (PGA) are based on simple analog building blocks (see Figure 4-1). Each of these blocks will be explained in more detail in the following sub-sections CH0 + ...

  • Page 17

    ... Current beyond ±2 mA can cause possible reli- ability problems. Applications that exceed this rating must be externally limited with an input resistor, as shown in Figure 4-2. R CHX IN V MCP6S2X IN Maximum expected ------------------------------------------------------------------------------ - – ...

  • Page 18

    MCP6S21/2/6/8 5.0 DIGITAL FUNCTIONS The MCP6S21/2/6/8 PGAs use a standard SPI com- patible serial interface to receive instructions from a controller. This interface is configured to allow daisy chaining with other SPI devices. There is an internal POR (Power On ...

  • Page 19

    Registers The analog functions are programmed through the SPI interface using 16-bit words (see Figure 5-1 and Figure 5-2). This data is sent to two of three 8-bit regis- ters: Instruction Register (Register 5-1), Gain Register (Register 5-2) and ...

  • Page 20

    MCP6S21/2/6/8 5.2.2 SETTING THE GAIN The amplifier can be programmed to produce binary and decimal gain settings between +1 V/V and +32 V/V. Register 5-2 shows the details. At the same time, differ- ent compensation capacitors are selected to optimize ...

  • Page 21

    CHANGING THE CHANNEL If the instruction register is programmed to address the channel register, the multiplexed inputs of the MCP6S22, MCP6S26 and MCP6S28 can be changed per Register 5-3. REGISTER 5-3: CHANNEL REGISTER U-x — bit 7 bit 7-3 ...

  • Page 22

    MCP6S21/2/6/8 5.2.4 SHUTDOWN COMMAND The software Shutdown command allows the user to put the amplifier into a low power mode (see Register 5-1). In this shutdown mode, most pins are high impedance (Section 4.4, “Shutdown Mode”, and Section 5.1, “SPI ...

  • Page 23

    10111213141516 SCK SI Instruction Byte for Device 2 SO (first 16 bits out are always zeros) FIGURE 5-4: Serial bus sequence for daisy-chain configuration; SPI 0,0 mode ...

  • Page 24

    MCP6S21/2/6/8 5.4 Power-On Reset If the power supply voltage goes below the POR trip voltage (V < V 1.7V), the internal POR circuit DD POR will reset all of the internal registers to their power-up defaults (this is a protection ...

  • Page 25

    ... Figure 6-2 can be used. A small series resistor (R at the V improves the phase margin by making the OUT load resistive at high frequencies. It will not, however, improve the bandwidth. R ISO V MCP6S2X IN FIGURE 6-2: PGA Circuit for Large Capacitive Loads. 2003 Microchip Technology Inc. For C 100 pF, a good estimate for R L value can be fine-tuned on the bench ...

  • Page 26

    ... As a result, the required dynamic range at the PGA’s output is less than at its input ( dB). MCP6S2X FIGURE 6-3: Wide Dynamic Range Current Measurement Circuit ...

  • Page 27

    EXPANDED INPUT PGA Figure 6-8 shows cascaded MCP6S28s that provide input channels. Obviously, Sensors #7-14 have a high total gain range available, as explained in Section 6.4.3, “Extended Gain Range”. These devices can be daisy chained ...

  • Page 28

    MCP6S21/2/6/8 7.0 PACKAGING INFORMATION 7.1 Package Marking Information 8-Lead PDIP (300 mil) (MCP6S21, MCP6S22) XXXXXXXX XXXXXNNN YYWW 8-Lead SOIC (150 mil) (MCP6S21, MCP6S22) XXXXXXXX XXXXYYWW NNN 8-Lead MSOP (MCP6S21, MCP6S22) XXXXX YWWNNN Legend: XX...X Customer specific information* YY Year code ...

  • Page 29

    Package Marking Information (Con’t) 14-Lead PDIP (300 mil) (MCP6S26) XXXXXXXXXXXXXX XXXXXXXXXXXXXX YYWWNNN 14-Lead SOIC (150 mil) (MCP6S26) XXXXXXXXXXX XXXXXXXXXXX YYWWNNN 14-Lead TSSOP (4.4mm) (MCP6S26) XXXXXXXX YYWW NNN 2003 Microchip Technology Inc. MCP6S21/2/6/8 Example: MCP6S26-I/P XXXXXXXXXXXXXX 0345256 Example: MCP6S26ISL XXXXXXXXXXXXXXXXXXXXXXXXX 0345256 ...

  • Page 30

    MCP6S21/2/6/8 Package Marking Information (Con’t) 16-Lead PDIP (300 mil) (MCP6S28) XXXXXXXXXXXXXX XXXXXXXXXXXXXX YYWWNNN 16-Lead SOIC (150 mil) (MCP6S28) XXXXXXXXXXXXX XXXXXXXXXXXXX YYWWNNN DS21117A-page 30 Example: MCP6S28-I/P XXXXXXXXXXXXXX 0345256 Example: MCP6S28-I/SL XXXXXXXXXXXXXXXXXXXXXXXX 0345256 2003 Microchip Technology Inc. ...

  • Page 31

    Plastic Dual In-line (P) – 300 mil (PDIP Dimension Limits Number of Pins Pitch Top to Seating Plane Molded Package Thickness Base to Seating Plane Shoulder to Shoulder Width Molded Package Width Overall Length Tip ...

  • Page 32

    MCP6S21/2/6/8 8-Lead Plastic Small Outline (SN) – Narrow, 150 mil (SOIC Dimension Limits Number of Pins Pitch Overall Height Molded Package Thickness Standoff § Overall Width Molded Package Width Overall Length Chamfer Distance ...

  • Page 33

    Plastic Micro Small Outline Package (MS) (MSOP (F) Dimension Limits Number of Pins Pitch Overall Height Molded Package Thickness Standoff § Overall Width Molded Package Width Overall Length Foot Length Footprint (Reference) Foot ...

  • Page 34

    MCP6S21/2/6/8 14-Lead Plastic Dual In-line (P) – 300 mil (PDIP Dimension Limits Number of Pins Pitch Top to Seating Plane Molded Package Thickness Base to Seating Plane Shoulder to Shoulder Width Molded Package Width ...

  • Page 35

    Plastic Small Outline (SL) – Narrow, 150 mil (SOIC Dimension Limits Number of Pins Pitch Overall Height Molded Package Thickness Standoff § Overall Width Molded Package Width Overall Length Chamfer Distance Foot ...

  • Page 36

    MCP6S21/2/6/8 14-Lead Plastic Thin Shrink Small Outline (ST) – 4.4 mm (TSSOP Dimension Limits Number of Pins Pitch Overall Height Molded Package Thickness Standoff § Overall Width Molded Package Width Molded Package Length Foot ...

  • Page 37

    Plastic Dual In-line (P) – 300 mil (PDIP Dimension Limits Number of Pins Pitch Top to Seating Plane Molded Package Thickness Base to Seating Plane Shoulder to Shoulder Width Molded Package Width Overall ...

  • Page 38

    MCP6S21/2/6/8 16-Lead Plastic Small Outline (SL) – Narrow 150 mil (SOIC Dimension Limits Number of Pins Pitch Overall Height Molded Package Thickness Standoff § Overall Width Molded Package Width Overall Length Chamfer Distance ...

  • Page 39

    NOTES: 2003 Microchip Technology Inc. MCP6S21/2/6/8 DS21117A-page 39 ...

  • Page 40

    PRODUCT IDENTIFICATION SYSTEM To order or obtain information, e.g., on pricing or delivery, refer to the factory or the listed sales office. PART NO. -X /XX Device Temperature Package Range Device: MCP6S21: One Channel PGA MCP6S21T: One Channel PGA (Tape ...

  • Page 41

    MCP6S21/2/6/8 NOTES: DS21117A-page 40 2002 Microchip Technology Inc. ...

  • Page 42

    Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families ...

  • Page 43

    M W ORLDWIDE AMERICAS Corporate Office 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7200 Fax: 480-792-7277 Technical Support: 480-792-7627 Web Address: http://www.microchip.com Rocky Mountain 2355 West Chandler Blvd. Chandler, AZ 85224-6199 Tel: 480-792-7966 Fax: 480-792-4338 Atlanta 3780 Mansell Road, ...