MAX1220 Datasheet PDF - Maxim Integrated Products

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MAX1220
Maxim Integrated Products

Part Number MAX1220
Description (MAX1220 - MAX1228) Multichannel ADCs/DACs
Page 30 Pages


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19-4010; Rev 1; 12/07
EVAALVUAAILTAIOBNLEKIT
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
General Description
The MAX1221/MAX1223/MAX1343 integrate a multichan-
nel, 12-bit, analog-to-digital converter (ADC) and a 12-bit,
digital-to-analog converter (DAC) in a single IC. The
devices also include a temperature sensor and config-
urable general-purpose I/O ports (GPIOs) with a 25MHz
SPI™-/QSPI™-/MICROWIRE™-compatible serial inter-
face. The ADC is available in a 12 or an eight input-chan-
nel version. The DAC outputs settle within 2.0µs, and the
ADC has a 225ksps conversion rate.
All devices include an internal reference (2.5V) providing
a well-regulated, low-noise reference for both the ADC
and DAC. Programmable reference modes for the ADC
and DAC allow the use of an internal reference, an exter-
nal reference, or a combination of both. Features such as
an internal ±1°C accurate temperature sensor, FIFO,
scan modes, programmable internal or external clock
modes, data averaging, and AutoShutdown™ allow users
to minimize both power consumption and processor
requirements. The low glitch energy (4nVs) and low digi-
tal feedthrough (0.5nVs) of the integrated DACs make
these devices ideal for digital control of fast-response
closed-loop systems.
The devices are guaranteed to operate with a supply volt-
age from +2.7V to +5.25V. The devices consume 2.5mA
at 225ksps throughput, only 22µA at 1ksps throughput,
and under 0.2µA in the shutdown mode. The MAX1221/
MAX1343 offer four GPIOs that can be configured as
inputs or outputs.
The MAX1221/MAX1223/MAX1343 are available in 36-pin
thin QFN packages. All devices are specified over the
-40°C to +85°C temperature range.
Applications
Closed-Loop Controls for Optical Components
and Base Stations
System Supervision and Control
Data-Acquisition Systems
Features
12-Bit, 225ksps ADC
Analog Multiplexer with True-Differential
Track/Hold (T/H)
12 Single-Ended Channels or Six Differential
Channels (Unipolar or Bipolar) (MAX1223)
Eight Single-Ended Channels or Four Differential
Channels (Unipolar or Bipolar)
(MAX1221/MAX1343)
Excellent Accuracy: ±0.5 LSB INL, ±0.5 LSB DNL
12-Bit, Octal, 2µs Settling DAC
(MAX1221/MAX1223)
Ultra-Low Glitch Energy (4nVs)
Power-Up Options from Zero Scale or Full Scale
Excellent Accuracy: ±0.5 LSB INL
Internal Reference or External Single-Ended/
Differential Reference
Internal Reference Voltage 2.5V
Internal ±1°C Accurate Temperature Sensor
On-Chip FIFO Capable of Storing 16 ADC
Conversion Results and One Temperature Result
On-Chip Channel-Scan Mode and Internal
Data-Averaging Features
Analog Single-Supply Operation
+2.7V to +5.25V
2.7V to AVDD Digital Supply
25MHz, SPI/QSPI/MICROWIRE Serial Interface
AutoShutdown Between Conversions
Low-Power ADC
2.5mA at 225ksps
22µA at 1ksps
0.2µA at Shutdown
Low-Power DAC: 1.5mA
Evaluation Kit Available (Order MAX1258EVKIT)
SPI and QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
Pin Configurations appear at end of data sheet.
Ordering Information/Selector Guide
PART
PIN-PACKAGE
REF
VOLTAGE
(V)
ANALOG
SUPPLY
VOLTAGE (V)
RESOLUTION ADC
BITS**
CHANNELS
MAX1221BETX 36 Thin QFN-EP*
2.5
2.7 to 5.25
12
8
MAX1223BETX 36 Thin QFN-EP*
2.5
2.7 to 5.25
12
12
MAX1343BETX 36 Thin QFN-EP*
2.5
2.7 to 5.25
12
8
Note: All devices are specified over the -40°C to +85°C operating temperature range.
*EP = Exposed pad.
**Number of resolution bits refers to both DAC and ADC.
DAC
CHANNELS
8
8
4
GPIOs
4
0
4
PKG
CODE
T3666-3
T3666-3
T3666-3
________________________________________________________________ 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.



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12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
ABSOLUTE MAXIMUM RATINGS
AVDD to AGND .........................................................-0.3V to +6V
DGND to AGND.....................................................-0.3V to +0.3V
DVDD to AVDD .......................................................-3.0V to +0.3V
Digital Inputs to DGND.............................................-0.3V to +6V
Digital Outputs to DGND .........................-0.3V to (DVDD + 0.3V)
Analog Inputs, Analog Outputs and REF_
to AGND...............................................-0.3V to (AVDD + 0.3V)
Maximum Current into Any Pin (except AGND, DGND, AVDD,
DVDD, and OUT_) ...........................................................50mA
Maximum Current into OUT_.............................................100mA
Continuous Power Dissipation (TA = +70°C)
36-Pin Thin QFN (6mm x 6mm)
(derate 26.3mW/°C above +70°C) ......................2105.3mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-60°C to +150°C
Junction Temperature ......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note: If the package power dissipation is not exceeded, one output at a time may be shorted to AVDD, DVDD, AGND, or DGND
indefinitely.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(AVDD = DVDD = 2.7V to 5.25V, external reference VREF = 2.5V, fCLK = 3.6MHz (50% duty cycle), TA = -40°C to +85°C, unless other-
wise noted. Typical values are at AVDD = DVDD = 3V. TA = +25°C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN
ADC
DC ACCURACY (Note 1)
Resolution
12
Integral Nonlinearity
INL
Differential Nonlinearity
DNL
Offset Error
Gain Error
(Note 2)
Gain Temperature Coefficient
Channel-to-Channel Offset
DYNAMIC SPECIFICATIONS (10kHz sine-wave input, VIN = 2.5VP-P, 225ksps, fCLK = 3.6MHz)
Signal-to-Noise Plus Distortion
SINAD
TYP
±0.5
±0.5
±0.5
±0.5
±0.8
±0.1
70
MAX UNITS
±1.0
±1.0
±4.0
±4.0
Bits
LSB
LSB
LSB
LSB
ppm/°C
LSB
dB
Total Harmonic Distortion
(Up to the Fifth Harmonic)
Spurious-Free Dynamic Range
Intermodulation Distortion
Full-Linear Bandwidth
Full-Power Bandwidth
CONVERSION RATE (Note 3)
THD
SFDR
IMD
fIN1 = 9.9kHz, fIN2 = 10.2kHz
SINAD > 70dB
-3dB point
External reference
-76 dBc
72 dBc
76 dBc
100 kHz
1 MHz
0.8 µs
Power-Up Time
tPU
Internal reference (Note 4)
Conversion
218 clock
cycles
2 _______________________________________________________________________________________



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12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = 2.7V to 5.25V, external reference VREF = 2.5V, fCLK = 3.6MHz (50% duty cycle), TA = -40°C to +85°C, unless other-
wise noted. Typical values are at AVDD = DVDD = 3V. TA = +25°C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
Acquisition Time
Conversion Time
External-Clock Frequency
Duty Cycle
Aperture Delay
SYMBOL
CONDITIONS
tACQ (Note 5)
Internally clocked
tCONV Externally clocked
fCLK Externally clocked conversion (Note 5)
Aperture Jitter
ANALOG INPUTS
Input Voltage Range (Note 6)
Input Leakage Current
Input Capacitance
Unipolar
Bipolar
INTERNAL TEMPERATURE SENSOR
Measurement Error (Notes 5, 7)
Temperature Resolution
INTERNAL REFERENCE
REF1 Output Voltage
TA = +25°C
TA = TMIN to TMAX
(Note 8)
REF1 Voltage Temperature
Coefficient
TCREF
REF1 Output Impedance
REF1 Short-Circuit Current
EXTERNAL REFERENCE
VREF = 2.5V
REF1 Input Voltage Range
VREF1 REF mode 11 (Note 4)
REF2 Input Voltage Range
(Note 4)
VREF2
REF mode 01
REF mode 11
MIN TYP MAX UNITS
0.6 µs
5.5
3.6
µs
0.1 3.6 MHz
40 60 %
30 ns
< 50
ps
0
-VREF / 2
±0.01
24
VREF
VREF / 2
±1
V
µA
pF
±0.7
±1.0
1/8
±2.0
°C
°C/LSB
2.482 2.50 2.518
V
±30 ppm/°C
6.5 kΩ
0.39 mA
1
AVDD +
V
0.05
1
AVDD +
0.05
V
01
_______________________________________________________________________________________ 3



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12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = 2.7V to 5.25V, external reference VREF = 2.5V, fCLK = 3.6MHz (50% duty cycle), TA = -40°C to +85°C, unless other-
wise noted. Typical values are at AVDD = DVDD = 3V. TA = +25°C. Outputs are unloaded, unless otherwise noted.)
PARAMETER
REF1 Input Current (Note 9)
REF2 Input Current
DC ACCURACY (Note 10)
Resolution
Integral Nonlinearity
Differential Nonlinearity
Offset Error
Offset-Error Drift
Gain Error
Gain Temperature Coefficient
DAC OUTPUT
Output Voltage Range
DC Output Impedance
Capacitive Load
Resistive Load to AGND
SYMBOL
CONDITIONS
IREF1
VREF = 2.5V, fSAMPLE = 225ksps
Acquisition between conversions
IREF2
VREF = 2.5V, fSAMPLE = 225ksps
Acquisition between conversions
DAC
INL
DNL
VOS
Guaranteed monotonic
(Note 8)
GE (Note 8)
No load
10kΩ load to either rail
(Note 11)
RL
AVDD = 2.7V, VREF = 2.5V,
gain error < 1%
MIN TYP MAX UNITS
25
±0.01
80
±1
µA
25
±0.01
80
±1
µA
12
±0.5
±4
Bits
LSB
±1.0
±3 ±10
LSB
mV
±10
ppm of
FS/°C
±5 ±10
LSB
±8
ppm of
FS/°C
0.02
0.1
2000
AVDD -
0.02
AVDD -
0.1
0.5
1
V
Ω
nF
Ω
4 _______________________________________________________________________________________



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