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PDF MAX1223 Data sheet ( Hoja de datos )

Número de pieza MAX1223
Descripción Multichannel ADCs/DACs
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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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.

1 page




MAX1223 pdf
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
SYMBOL
CONDITIONS
Wake-Up Time (Note 12)
1kΩ Output Termination
From power-down mode, AVDD = 5V
From power-down mode, AVDD = 2.7V
Programmed in power-down mode
100kΩ Output Termination
At wake-up or programmed in
power-down mode
DYNAMIC PERFORMANCE (Notes 5, 13)
Output-Voltage Slew Rate
SR Positive and negative
Output-Voltage Settling Time
Digital Feedthrough
tS To 1 LSB, 400 - C00 hex (Note 7)
Code 0, all digital inputs from 0 to DVDD
Major Code Transition Glitch
Impulse
Between codes 2047 and 2048
Output Noise (0.1Hz to 50MHz)
From VREF
Using internal reference
Output Noise (0.1Hz to 500kHz)
From VREF
Using internal reference
DAC-to-DAC Transition
Crosstalk
INTERNAL REFERENCE
REF1 Output Voltage
REF1 Temperature Coefficient
REF1 Short-Circuit Current
EXTERNAL-REFERENCE INPUT
TCREF
VREF = 2.5V
REF1 Input Voltage Range
REF1 Input Impedance
VREF1
RREF1
REF modes 01, 10, and 11 (Note 4)
DIGITAL INTERFACE
DIGITAL INPUTS (SCLK, DIN, CS, CNVST, LDAC)
Input-Voltage High
VIH DVDD = 2.7V to 5.25V
Input-Voltage Low
VIL
DVDD = 3.6V to 5.25V
DVDD = 2.7V to 3.6V
Input Leakage Current
IL
Input Capacitance
CIN
DIGITAL OUTPUT (DOUT) (Note 14)
Output-Voltage Low
VOL ISINK = 2mA
MIN
3
2.482
0.7
70
2.4
TYP MAX
25
21
1
100
25
0.5
4
660
720
260
320
0.5
2.50 2.518
±30
0.39
AVDD
100 130
±0.01
15
0.8
0.6
±10
0.4
UNITS
µs
kΩ
kΩ
V/µs
µs
nVs
nVs
µVP-P
µVP-P
nVs
V
ppm/°C
mA
V
kΩ
V
V
µA
pF
V
_______________________________________________________________________________________ 5

5 Page





MAX1223 arduino
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
Typical Operating Characteristics (continued)
(AVDD = DVDD = 3V external VREF = 2.5V, fCLK = 3.6MHz (50% duty cycle), fSAMPLE = 225ksps, CLOAD = 50pF, 0.1µF capacitor at
REF, TA = +25°C, unless otherwise noted.)
DAC FULL-SCALE ERROR
vs. REFERENCE VOLTAGE
1.00
AVDD = DVDD = 5V
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
DAC FULL-SCALE ERROR
vs. REFERENCE VOLTAGE
0
-1
-2
-3
-4
-5
-6
DAC FULL-SCALE ERROR
vs. LOAD CURRENT
5
AVDD = DVDD = 5V
EXTERNAL REFERENCE = 4.096V
0
-5
-10
-1.00
0
1234
REFERENCE VOLTAGE (V)
5
-7
0 0.5 1.0 1.5 2.0 2.5 3.0
REFERENCE VOLTAGE (V)
-15
0
5 10 15 20 25
LOAD CURRENT (mA)
30
DAC FULL-SCALE ERROR
vs. LOAD CURRENT
5
INTERNAL REFERENCE
VOLTAGE vs. TEMPERATURE
2.52
ADC REFERENCE SUPPLY CURRENT
vs. ANALOG SUPPLY VOLTAGE
25.1
0 2.51 25.0
-5 2.50 24.9
-10 2.49 24.8
-15
0
41.0
0.5 1.0 1.5 2.0 2.5
LOAD CURRENT (mA)
3.0
ADC REFERENCE SUPPLY
CURRENT vs. TEMPERATURE
40.9
40.8
40.7
40.6
AVDD = DVDD = 5V
EXTERNAL REFERENCE = 4.096V
40.5
-40 -15 10
35
TEMPERATURE (°C)
60
85
2.48
-40
-15 10 35 60
TEMPERATURE (°C)
85
ADC REFERENCE SUPPLY
CURRENT vs. TEMPERATURE
25.1
25.0
24.9
24.8
AVDD = DVDD = 3V
EXTERNAL REFERENCE = 2.5V
24.7
-40 -15 10
35
TEMPERATURE (°C)
60
85
24.7
2.5
3.0 3.5 4.0 4.5 5.0
SUPPLY VOLTAGE (V)
5.5
0
-20
-40
-60
-80
-100
-120
-140
-160
0
ADC FFT PLOT
fSAMPLE = 32.768kHz
fANALOG_)N = 10.080kHz
fCLK = 5.24288MHz
SINAD = 71.27dBc
SNR = 71.45dBc
THD = 85.32dBc
SFDR = 87.25dBc
50 100 150
ANALOG INPUT FREQUENCY (kHz)
200
______________________________________________________________________________________ 11

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