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PDF MAX1202 Data sheet ( Hoja de datos )
| Número de pieza | MAX1202 | |
| Descripción | 12-Bit ADCs | |
| Fabricantes | Maxim Integrated | |
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MAX1202/MAX1203
EVALUATION KIT AVAILABLE
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
General Description
The MAX1202/MAX1203 are 12-bit data-acquisition sys-
tems specifically designed for use in applications with
mixed +5V (analog) and +3V (digital) supply voltages.
They operate with a single +5V analog supply or dual ±5V
analog supplies, and combine an 8-channel multiplexer,
high-bandwidth track/hold, and serial interface with high
conversion speed and low power consumption.
A 4-wire serial interface connects directly to SPI/
MICROWIRE® devices without external logic, and a serial
strobe output allows direct connection to TMS320-family
digital signal processors. The MAX1202/MAX1203 use
either the internal clock or an external serial-interface clock
to perform successive approximation analog-to-digital con-
versions. The serial interface operates at up to 2MHz.
The MAX1202 features an internal 4.096V reference,
while the MAX1203 requires an external reference. Both
parts have a reference-buffer amplifier that simplifies gain
trim. They also have a VL pin that is the power supply for
the digital outputs. Output logic levels (3V, 3.3V, or 5V) are
determined by the value of the voltage applied to this pin.
These devices provide a hard-wired SHDN pin and two
software-selectable power-down modes. Accessing the
serial interface automatically powers up the devices. A
quick turn-on time enables the MAX1202/MAX1203 to
be shut down between conversions, allowing the user
to optimize supply currents. By customizing power-down
between conversions, supply current can drop below
10μA at reduced sampling rates.
The MAX1202/MAX1203 are available in 20-pin SSOP
and PDIP packages, and are specified for the commercial
and extended temperature ranges.
Applications
●● 5V/3V Mixed-Supply Systems
●● Data Acquisition
●● High-Accuracy Process Control
●● Battery-Powered Instruments
●● Medical Instruments
Typical Operating Circuit appears at end of data sheet.
MICROWIRE is a registered trademark of National
Semiconductor Corp.
Features
●● 8-Channel Single-Ended or 4-Channel Differential
Inputs
●● Operates from Single +5V or Dual ±5V Supplies
●● User-Adjustable Output Logic Levels
(2.7V to 5.25V)
●● Low Power: 1.5mA (Operating Mode)
2μA (Power-Down Mode)
●● Internal Track/Hold, 133kHz Sampling Rate
●● Internal 4.096V Reference (MAX1202)
●● SPI/MICROWIRE/TMS320-Compatible
4-Wire Serial Interface
●● Software-Configurable Unipolar/Bipolar Inputs
●● 20-Pin PDIP/SSOP
Ordering Information
PART
MAX1202ACPP+
TEMP RANGE
0ºC to +70ºC
PIN-
PACKAGE
20 PDIP
INL
(LSB)
±1/2
MAX1202BCPP+ 0ºC to +70ºC 20 PDIP
±1
MAX1202ACAP+
MAX1202BCAP+
0ºC to +70ºC
0ºC to +70ºC
20 SSOP
20 SSOP
±1/2
±1
Ordering Information continued at end of data sheet.
+Denotes a lead(Pb)-free/RoHS-compliant package.
Pin Configuration
TOP VIEW
+
CH0 1
CH1 2
CH2 3
CH3 4
CH4 5
MAX1202
MAX1203
CH5 6
CH6 7
CH7 8
VSS 9
SHDN 10
20 VDD
19 SCLK
18 CS
17 DIN
16 SSTRB
15 DOUT
14 VL
13 GND
12 REFADJ
11 REF
PDIP/SSOP
19-1173; Rev 3; 3/12
1 page  
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
Electrical Characteristics (continued)
(VDD = +5V ±5%, VL = 2.7V to 3.6V; VSS = 0V or -5V ±5%; fSCLK = 2.0MHz, external clock (50% duty cycle); 15 clocks/conversion
cycle (133ksps); MAX1202—4.7μF capacitor at REF pin; MAX1203—external reference, VREF = 4.096V applied to REF pin; TA = TMIN
to TMAX, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
DIGITAL INPUTS—DIN, SCLK, CS, SHDN
DIN, SCLK, CS Input High Voltage
VIH
DIN, SCLK, CS Input Low Voltage
VIL
DIN, SCLK, CS Input Hysteresis
VHYST
DIN, SCLK, CS Input Leakage
IIN VIN = 0V or VDD
DIN, SCLK, CS Input Capacitance
CIN (Note 6)
SHDN Input High Voltage
VSH
SHDN Input Mid Voltage
VSM
SHDN Voltage, Unconnected
VFLT SHDN = open
SHDN Input Low Voltage
VSL
SHDN Input Current, High
ISH SHDN = VDD
SHDN Input Current, Low
ISL VSHDN = 0V
SHDN Maximum Allowed Leakage,
Mid-Input
SHDN = open
MIN TYP MAX UNITS
2.0
0.8
0.15
±1
15
VDD - 0.5
1.5 VDD - 1.5
2.75
0.5
4.0
-4.0
-100
+100
V
V
V
µA
pF
V
V
V
V
µA
µA
nA
DIGITAL OUTPUTS—DOUT, SSTR (VL = 2.7V to 3.6V)
Output Voltage Low
VOL
ISINK = 3mA
ISINK = 6mA
Output Voltage High
VOH ISOURCE = 1mA
Three-State Leakage Current
ILEAK CS = VL
Three-State Output Capacitance
COUT CS = VL (Note 6)
DIGITAL OUTPUTS—DOUT, SSTR (VL = 4.75V to 5.25V)
Output Voltage Low
VOL
ISINK = 5mA
ISINK = 8mA
Output Voltage High
VOH ISOURCE = 1mA
Three-State Leakage Current
ILEAK VCS = 5V
Three-State Output Capacitance
COUT VCS = 5V (Note 6)
0.3
VL - 0.5
0.4
±10
15
V
V
µA
pF
0.4
0.3
V
4V
±10 µA
15 pF
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX1202/MAX1203
5V, 8-Channel, Serial, 12-Bit ADCs
with 3V Digital Interface
Table 1a. Unipolar Full Scale and Zero
Scale
REFERENCE
ZERO
SCALE
FULL SCALE
Internal
0V +4.096V
External
at REFADJ
at REF
0V
0V
VREFADJ x A*
VREF
*A = 1.68 for the MAX1202, 1.64 for the MAX1203.
Input Bandwidth
The ADC’s input tracking circuitry has a 4.5MHz small-
signal bandwidth. Therefore it is possible to digitize high-
speed transient events and measure periodic signals
with bandwidths exceeding the ADC’s sampling rate by
using undersampling techniques. To avoid high-frequency
signals being aliased into the frequency band of interest,
anti-alias filtering is recommended.
Analog Input Range and Input Protection
Internal protection diodes, which clamp the analog inputs
to VDD and VSS, allow the analog input pins to swing from
(VSS - 0.3V) to (VDD + 0.3V) without damage. However,
for accurate conversions near full scale, the inputs must
not exceed VDD by more than 50mV, or be lower than
VSS by 50mV.
If the analog input exceeds 50mV beyond the sup-
plies, do not forward bias the protection diodes of
off-channels more than 2mA.
The full-scale input voltage depends on the voltage at
REF (Tables 1a and 1b).
Quick Look
Use the circuit of Figure 5 to quickly evaluate the MAX1202/
MAX1203’s analog performance. The MAX1202/MAX1203
require a control byte to be written to DIN before each con-
version. Tying DIN to +3V feeds in control byte $FF hex,
Table 1b. Bipolar Full Scale, Zero Scale,
and Negative Full Scale
REFERENCE
NEGATIVE
FULL SCALE
ZERO
SCALE
FULL SCALE
Internal
+4.096V/2 0V +4.096V/2
at -1/2 VREFADJ
External REFADJ
x A*
0V
+1/2 VREFADJ
x A*
at REF
+1/2 VREF
0V
+1/2 VREF
*A = 1.68 for the MAX1202, 1.64 for the MAX1203.
which triggers single-ended unipolar conversions on CH7
in external clock mode without powering down between
conversions. In external clock mode, the SSTRB output
pulses high for one clock period before the most signifi-
cant bit of the 12-bit conversion result shifts out of DOUT.
Varying the analog input to CH7 alters the sequence of
bits from DOUT. A total of 15 clock cycles per conversion
is required. All SSTRB and DOUT output transitions occur
on SCLK’s falling edge.
How to Start a Conversion
Clocking a control byte into DIN starts conversion on the
MAX1202/MAX1203. With CS low, each rising edge on
SCLK clocks a bit from DIN into the MAX1202/MAX1203’s
internal shift register. After CS falls, the first logic “1” bit
defines the control byte’s MSB. Until this first “start” bit
arrives, any number of logic “0” bits can be clocked into
DIN with no effect. Table 2 shows the control-byte format.
The MAX1202/MAX1203 are fully compatible with SPI/
MICROWIRE devices. For SPI, select the correct clock
polarity and sampling edge in the SPI control registers:
set CPOL = 0 and CPHA = 0. MICROWIRE and SPI both
transmit and receive a byte at the same time. Using the
Typical Operating Circuit, the simplest software interface
requires only three 8-bit transfers to perform a conversion
(one 8-bit transfer to configure the ADC, and two more
8-bit transfers to clock out the 12-bit conversion result).
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX1202.PDF ] | |
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