MAX148BEAP Maxim Integrated Products, MAX148BEAP Datasheet

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MAX148BEAP

Manufacturer Part Number
MAX148BEAP
Description
ADC (A/D Converters)
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX148BEAP

Number Of Adc Inputs
8
Architecture
SAR
Conversion Rate
133 KSPs
Resolution
10 bit
Input Type
Voltage
Interface Type
4-Wire (SPI, QSPI, Microwire, TMS320)
Voltage Reference
Internal 2.5 V or External
Supply Voltage (max)
5 V
Maximum Power Dissipation
640 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
SSOP-20
Minimum Operating Temperature
- 40 C
Lead Free Status / Rohs Status
No

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
MAX148BEAP
Manufacturer:
MAXIM
Quantity:
60
Part Number:
MAX148BEAP+
Manufacturer:
MAXIM/美信
Quantity:
20 000
Part Number:
MAX148BEAP+T
Manufacturer:
MAX
Quantity:
6 995
The MAX148/MAX149 10-bit data-acquisition systems
combine an 8-channel multiplexer, high-bandwidth
track/hold, and serial interface with high conversion
speed and low power consumption. They operate from a
single +2.7V to +5.25V supply, and sample to 133ksps.
Both devices’ analog inputs are software configurable for
unipolar/bipolar and single-ended/differential operation.
The 4-wire serial interface connects directly to SPIK/
QSPIK and MICROWIREK devices without external
logic. A serial-strobe output allows direct connection to
TMS320-family digital signal processors. The MAX148/
MAX149 use either the internal clock or an external seri-
al-interface clock to perform successive-approximation
analog-to-digital conversions.
The MAX149 has an internal 2.5V reference, while the
MAX148 requires an external reference. Both parts
have a reference-buffer amplifier with a Q1.5% voltage-
adjustment range.
These devices provide a hard-wired SHDN pin and
a software-selectable power-down, and can be pro-
grammed to automatically shut down at the end of a
conversion. Accessing the serial interface automatically
powers up the MAX148/MAX149, and the quick turn-on
time allows them to be shut down between all conver-
sions. This technique can cut supply current to under
60FA at reduced sampling rates.
The MAX148/MAX149 are available in a 20-pin DIP and
a 20-pin SSOP.
For 4-channel versions of these devices, see the
MAX1248/MAX1249 data sheet.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
19-0464; Rev 4; 1/10
Pin Configuration appears at end of data sheet.
SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp.
Portable Data Logging
Data Acquisition
Medical Instruments
Battery-Powered Instruments
Pen Digitizers
Process Control
_______________________________________________________________ Maxim Integrated Products 1
+2.7V to +5.25V, Low-Power, 8-Channel,
General Description
Applications
S
S
S
S
S
S
S
Ordering Information continued at end of data sheet.
† Contact factory for availability of alternate surface-mount
package. Specify lead-free by placing + by the part number
when ordering.
*Contact factory for availability of CERDIP package, and for
processing to MIL-STD-883B. Not available in lead-free.
MAX148ACPP
MAX148BCPP
MAX148ACAP
MAX148BCAP
8-Channel Single-Ended or 4-Channel Differential
Inputs
Single-Supply Operation: +2.7V to +5.25V
Internal 2.5V Reference (MAX149)
Low Power: 1.2mA (133ksps, 3V Supply)
SPI/QSPI/MICROWIRE/TMS320-Compatible 4-Wire
Serial Interface
Software-Configurable Unipolar or Bipolar Inputs
20-Pin DIP/SSOP Packages
ANALOG
PART†
INPUTS
0.01FF
4.7FF
+2.5V
O TO
Serial 10-Bit ADCs
Typical Operating Circuit
CH0
CH7
VREF
READJ
54µA (1ksps, 3V Supply)
1µA (Power-Down Mode)
MAX149
TEMP RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
Ordering Information
SSTRB
DGND
AGND
SHDN
DOUT
SCLK
COM
V
DIN
CS
DD
0.1FF
+3V
20 Plastic DIP
20 Plastic DIP
PACKAGE
20 SSOP
20 SSOP
PIN-
V
I/O
SCK (SK)
MOSI (SO)
MISO (SI)
Features
DD
CPU
V
SS
(LSB)
±1/2
±1/2
INL
±1
±1

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MAX148BEAP Summary of contents

Page 1

... Process Control Pin Configuration appears at end of data sheet. SPI and QSPI are trademarks of Motorola, Inc. MICROWIRE is a trademark of National Semiconductor Corp. _______________________________________________________________ Maxim Integrated Products 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ...

Page 2

Low-Power, 8-Channel, Serial 10-Bit ADCs ABSOLUTE MAXIMUM RATINGS V to AGND, DGND ..............................................-0.3V to +6V DD AGND to DGND ...................................................-0.3V to +0.3V CH0–CH7, COM to AGND, DGND ........... -0. VREF, REFADJ to AGND ...........................-0.3V to ...

Page 3

Low-Power, 8-Channel, ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.25V; COM = MAX149—4.7FF capacitor at VREF pin; MAX148—external reference, VREF = 2.500V applied to VREF pin; T otherwise noted.) PARAMETER SYMBOL CONVERSION RATE (continued) ...

Page 4

Low-Power, 8-Channel, Serial 10-Bit ADCs ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.25V; COM = MAX149—4.7FF capacitor at VREF pin; MAX148—external reference, VREF = 2.500V applied to VREF pin; T otherwise noted.) PARAMETER SYMBOL ...

Page 5

Low-Power, 8-Channel, TIMING CHARACTERISTICS (V = +2.7V to +5.25V MIN PARAMETER SYMBOL Acquisition Time DIN to SCLK Setup DIN to SCLK Hold SCLK Fall to Output Data Valid CS Fall ...

Page 6

Low-Power, 8-Channel, Serial 10-Bit ADCs (V = 3.0V, VREF = 2.500V 2.0MHz SCLK INTEGRAL NONLINEARITY vs. CODE 0.10 0.05 0 -0.05 -0.10 0 256 512 768 CODE SUPPLY CURRENT vs. SUPPLY VOLTAGE 2.00 ...

Page 7

Low-Power, 8-Channel, PIN NAME 1–8 CH0–CH7 Sampling Analog Inputs Ground Reference for Analog Inputs. COM sets zero-code voltage in single-ended mode. Must be 9 COM stable to ±0.5 LSB. Three-Level Shutdown Input. Pulling SHDN low shuts the ...

Page 8

Low-Power, 8-Channel, Serial 10-Bit ADCs Detailed Description The MAX148/MAX149 analog-to-digital converters (ADCs) use a successive-approximation conversion technique and input track/hold (T/H) circuitry to convert an analog signal to a 10-bit digital output. A flexible serial interface provides ...

Page 9

Low-Power, 8-Channel +2.500V CH7 ANALOG 0.01µF INPUT +3V +3V REFADJ 2.5V V OUT VREF C1 1000pF MAX872 0.1µF COMP OPTIONAL FOR MAX149, REQUIRED FOR MAX148 *FULL-SCALE ANALOG INPUT, CONVERSION RESULT = $FFF (HEX) Figure 5. ...

Page 10

Low-Power, 8-Channel, Serial 10-Bit ADCs Table 1. Control-Byte Format BIT 7 BIT 6 (MSB) START SEL2 BIT NAME 7(MSB) START The first logic “1” bit after CS goes low defines the beginning of the control byte. 6 ...

Page 11

Low-Power, 8-Channel, Table 3. Channel Selection in Differential Mode (SGL/DIF = 0) SEL2 SEL1 SEL0 ...

Page 12

Low-Power, 8-Channel, Serial 10-Bit ADCs CS t CSS t CSH SCLK DIN t DV DOUT Figure 7. Detailed Serial-Interface Timing CS t SDV SSRTB SCLK Figure 8. External Clock Mode SSTRB Detailed Timing ...

Page 13

Low-Power, 8-Channel SCLK SEL2 SEL1 SEL0 DIN START SSTRB DOUT AD STATE Figure 9. Internal Clock Mode Timing CS t CSH SSTRB SCLK PD0 CLOCK IN DOUT NOTE: FOR BEST NOISE PERFORMANCE, KEEP ...

Page 14

Low-Power, 8-Channel, Serial 10-Bit ADCs Table 4. Typical Power-Up Delay Times REFERENCE- REFERENCE BUFFER BUFFER COMPENSATION MODE Enabled Internal Enabled Internal Enabled External Enabled External Disabled — Disabled — the control byte (the PD0 bit) is clocked ...

Page 15

Low-Power, 8-Channel SCLK DIN S CONTROL BYTE 0 DOUT SSTRB Figure 11a. External Clock Mode, 15 Clocks/Conversion Timing SCLK DIN S CONTROL BYTE 0 DOUT Figure 11b. External Clock Mode, 16 Clocks/Conversion ...

Page 16

Low-Power, 8-Channel, Serial 10-Bit ADCs CLOCK MODE SETS INTERNAL CLOCK MODE DIN DOUT SSTRB CONVERSION MODE Figure 12b. Timing Diagram Power-Down Modes, Internal Clock Table 5. Software Power-Down and ...

Page 17

Low-Power, 8-Channel, AVERAGE SUPPLY CURRENT vs. CONVERSION RATE (USING FASTPD) 10,000 = ∞ R LOAD CODE = 1010101000 1000 8 CHANNELS 100 100 1k CONVERSION RATE (Hz) Figure 14b. MAX149 Supply Current ...

Page 18

Low-Power, 8-Channel, Serial 10-Bit ADCs DIN FULLPD 1.21V 0 REFADJ 2.50V 0 VREF Figure 15. MAX149 FULLPD/FASTPD Power-Up Sequence +3.3V 24kI 510kI REFADJ 100kI 12 0.01µF Figure 16. MAX149 Reference-Adjust Circuit Lowest Power at ...

Page 19

Low-Power, 8-Channel, Table 7. Full Scale and Zero Scale UNIPOLAR MODE Full Scale Zero Scale VREF + COM COM OUTPUT CODE VREF COM 011 . . . 111 2 011 . . . 110 ...

Page 20

Low-Power, 8-Channel, Serial 10-Bit ADCs 1 CH0 2 CH1 3 CH2 4 CH3 ANALOG INPUTS 5 CH4 6 CH5 7 CH6 8 CH7 9 COM 10 SHDN Figure 20. MAX148/MAX149 QSPI Connections, External Reference XF CS CLKX ...

Page 21

Low-Power, 8-Channel, CS SCLK DIN START SEL2 SEL1 SSTRB DOUT Figure 22. TMS320 Serial-Interface Timing Diagram High-Speed Digital Interfacing with QSPI The MAX148/MAX149 can interface with QSPI using the circuit in Figure 2.0MHz, CPOL ...

Page 22

... Serial 10-Bit ADCs Ordering Information (continued) PART† TEMP RANGE MAX148AEPP -40°C to +85°C MAX148BEPP -40°C to +85°C MAX148AEAP -40°C to +85°C MAX148BEAP -40°C to +85°C MAX148AMJP -55°C to +125°C MAX148BMJP -55°C to +125°C MAX149ACPP 0°C to +70°C MAX149BCPP 0°C to +70°C MAX149ACAP 0° ...

Page 23

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 2010 Maxim Integrated Products © ...

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