MAX1248BEEE+ Maxim Integrated Products, MAX1248BEEE+ Datasheet

IC ADC 10BIT SERIAL 16-QSOP

MAX1248BEEE+

Manufacturer Part Number
MAX1248BEEE+
Description
IC ADC 10BIT SERIAL 16-QSOP
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1248BEEE+

Number Of Bits
10
Sampling Rate (per Second)
133k
Data Interface
MICROWIRE™, QSPI™, Serial, SPI™
Number Of Converters
1
Power Dissipation (max)
3.6mW
Voltage Supply Source
Single Supply
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
16-SSOP (0.150", 3.90mm Width)
Number Of Adc Inputs
4
Architecture
SAR
Conversion Rate
133 KSPs
Resolution
10 bit
Input Type
Voltage
Interface Type
4-Wire (SPI, QSPI, MICROWIRE, TMS320)
Voltage Reference
2.5 V
Supply Voltage (max)
5.25 V
Supply Voltage (min)
2.7 V
Maximum Power Dissipation
842 mW
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Minimum Operating Temperature
- 40 C
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX1248/MAX1249 10-bit data-acquisition sys-
tems combine a 4-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 their analog
inputs are software configurable for unipolar/bipolar
and single-ended/differential operation.
The 4-wire serial interface connects directly to SPI™/
QSPI™ and MICROWIRE™ devices without external
logic. A serial strobe output allows direct connection
to TMS320-family digital signal processors. The
MAX1248/MAX1249 use either the internal clock or an
external serial-interface clock to perform successive-
approximation analog-to-digital conversions.
The MAX1248 has an internal 2.5V reference, while the
MAX1249 requires an external reference. Both parts
have a reference-buffer amplifier with a ±1.5% 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 MAX1248/MAX1249, and the quick
turn-on time allows them to be shut down between all
conversions. This technique can cut supply current to
under 60µA at reduced sampling rates.
The MAX1248/MAX1249 are available in a 16-pin DIP
and a very small QSOP that occupies the same board
area as an 8-pin SO.
For 8-channel versions of these devices, see the
MAX148/MAX149 data sheet.
Portable Data Logging
Medical Instruments
Pen Digitizers
________________________Applications
19-1072; Rev 2; 5/98
_______________ General Description
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 408-737-7600 ext. 3468.
Pin Configuration appears at end of data sheet.
________________________________________________________________ Maxim Integrated Products
+2.7V to +5.25V, Low-Power, 4-Channel,
Data Acquisition
Battery-Powered Instruments
System Supervision
Serial 10-Bit ADCs in QSOP-16
____________________________Features
_____________ Ordering Information
Ordering Information continued at end of data sheet.
__________Typical Operating Circuit
Contact factory for availability of alternate surface-mount
packages.
MAX1248ACPE
MAX1248BCPE
MAX1248ACEE
MAX1248BCEE
4-Channel Single-Ended or 2-Channel
Differential Inputs
Single +2.7V to +5.25V Operation
Internal 2.5V Reference (MAX1248)
Low Power: 1.2mA (133ksps, +3V supply)
SPI/QSPI/MICROWIRE/TMS320-Compatible
4-Wire Serial Interface
Software-Configurable Unipolar or Bipolar Inputs
16-Pin QSOP Package (same area as 8-pin SO)
PART
ANALOG
0.01 F
INPUTS
4.7 F
0V TO
+2.5V
C1
C2
CH3
CH0
VREF
REFADJ
MAX1248
54µA (1ksps, +3V supply)
1µA (power-down mode)
TEMP. RANGE
0°C to +70°C
0°C to +70°C
0°C to +70°C
0°C to +70°C
SSTRB
DGND
AGND
SHDN
SCLK
DOUT
COM
V
DIN
CS
DD
+3V
0.1 F
C3
16 Plastic DIP
16 Plastic DIP
16 QSOP
16 QSOP
PIN-PACKAGE
SCK (SK)
MOSI (SO)
MISO (SI)
V
I/O
DD
CPU
V
SS
(LSB)
±1/2
±1
±1/2
±1
INL
1

Related parts for MAX1248BEEE+

MAX1248BEEE+ Summary of contents

Page 1

... 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 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 408-737-7600 ext. 3468. ...

Page 2

Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-16 ABSOLUTE MAXIMUM RATINGS V to AGND, DGND .............................................. -0.3V to +6V DD AGND to DGND.................................................... -0.3V to +0.3V CH0–CH3, COM to AGND, DGND ............ -0. VREF to AGND........................................... ...

Page 3

Low-Power, 4-Channel, ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.25V; COM = 0V MAX1248—4.7µF capacitor at VREF pin; MAX1249—external reference, VREF = 2.500V applied to VREF pin; T unless otherwise noted.) PARAMETER SYMBOL ANALOG/COM INPUTS ...

Page 4

Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-16 ELECTRICAL CHARACTERISTICS (continued +2.7V to +5.25V; COM = 0V MAX1248—4.7µF capacitor at VREF pin; MAX1249—external reference; VREF = 2.500V applied to VREF pin, T unless otherwise ...

Page 5

Low-Power, 4-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, 4-Channel, Serial 10-Bit ADCs in QSOP-16 __________________________________________Typical Operating Characteristics (V = 3.0V, VREF = 2.500V 2.0MHz SCLK SUPPLY CURRENT vs. SUPPLY VOLTAGE 2. CODE = 10101010 C = 50pF ...

Page 7

Low-Power, 4-Channel, ______________________________________________________________Pin Description PIN NAME 1 V Positive Supply Voltage DD 2–5 CH0–CH3 Sampling Analog Inputs Ground reference for analog inputs. Sets zero-code voltage in single-ended mode. Must be stable to 6 COM ±0.5LSB. Three-Level Shutdown ...

Page 8

Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-16 _______________Detailed Description The MAX1248/MAX1249 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 ...

Page 9

Low-Power, 4-Channel, Table 1. Control-Byte Format BIT 7 BIT 6 BIT 5 (MSB) START SEL2 SEL1 BIT NAME DESCRIPTION The first logic “1” bit after CS goes low defines the beginning of the control byte. 7(MSB) START ...

Page 10

Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-16 Table 2. Channel Selection in Single-Ended Mode SEL2 SEL1 SEL0 Table 3. Channel Selection in Differential Mode (SGL/D ...

Page 11

Low-Power, 4-Channel, CS SCLK 1 4 UNI/ SGL/ DIN SEL2 SEL1 SEL0 BIP DIF START SSTRB RB1 DOUT ACQUISITION A/D STATE IDLE (f CLK Figure 5. 24-Clock External Clock Mode Conversion Timing (MICROWIRE and SPI-Compatible, QSPI-Compatible with ...

Page 12

Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP- SDV SSTRB SCLK Figure 7. External Clock Mode SSTRB Detailed Timing CS SCLK UNI/ DIN SEL2 SEL1 SEL0 BIP START SSTRB DOUT A/D ...

Page 13

Low-Power, 4-Channel, The falling edge of CS does not start a conversion. The first logic high clocked into DIN is interpreted as a start bit and defines the first bit of the control byte. A conver- sion ...

Page 14

Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP- SCLK DIN S CONTROL BYTE 0 DOUT SSTRB Figure 10a. External Clock Mode, 15 Clocks/Conversion Timing CS SCLK S CONTROL BYTE 0 DIN DOUT Figure 10b. External ...

Page 15

Low-Power, 4-Channel, Table 4. Typical Power-Up Delay Times REFERENCE-BUFFER REFERENCE COMPENSATION BUFFER MODE Enabled Internal Enabled Internal Enabled External Enabled External Disabled — Disabled — CLOCK MODE SHDN SETS EXTERNAL CLOCK MODE DIN ...

Page 16

Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-16 Table 5. Software Power-Down and Clock Mode PD1 PD0 Full Power-Down 0 0 Fast Power-Down 0 1 Internal Clock 1 0 External Clock 1 1 Table 6. Hardware Power-Down and ...

Page 17

Low-Power, 4-Channel, 100 R = LOAD CODE = 1010101000 10 4 CHANNELS 1 CHANNEL 1 0.01 0 CONVERSION RATE (Hz) Figure 13a. MAX1248 Supply Current vs. Conversion Rate, FULLPD Lowest Power at Higher Throughputs Figure ...

Page 18

Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-16 (ZEROS) DIN FULLPD 1.21V REFADJ 0V 2.50V VREF 0V Figure 14. MAX1248 FULLPD/FASTPD Power-Up Sequence External Reference With both the MAX1248 and MAX1249, an external ref- erence ...

Page 19

Low-Power, 4-Channel, Table 7. Full Scale and Zero Scale UNIPOLAR MODE Full Scale VREF + COM OUTPUT CODE FS = VREF + COM 011 . . . 111 2 011 . . . 110 ZS = COM ...

Page 20

Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP- 0 CH0 MAX1248 3 CH1 MAX1249 ANALOG INPUTS 4 CH2 5 CH3 COM 6 SHDN 7 +2.5V VREF 8 0.1 F Figure 19. MAX1248/MAX1249 QSPI ...

Page 21

Low-Power, 4-Channel, CS SCLK DIN START SEL2 SEL1 SEL0 SSTRB DOUT Figure 21. TMS320 Serial-Interface Timing Diagram ___________________________________________Ordering Information (continued) † PART TEMP. RANGE MAX1248AEPE -40°C to +85°C MAX1248BEPE -40°C to +85°C MAX1248AEEE -40°C to +85°C MAX1248BEEE ...

Page 22

Low-Power, 4-Channel, Serial 10-Bit ADCs in QSOP-16 _________________ Pin Configuration TOP VIEW CH0 2 15 CH1 3 14 MAX1248 13 CH2 4 MAX1249 CH3 COM 6 SHDN 7 10 VREF ...

Page 23

Low-Power, 4-Channel, ___________________________________________Package Information (continued) ______________________________________________________________________________________ Serial 10-Bit ADCs in QSOP-16 23 ...

Page 24

... 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. 24 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 1998 Maxim Integrated Products NOTES Printed USA is a registered trademark of Maxim Integrated Products ...

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