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PDF MAX111 Data sheet ( Hoja de datos )
| Número de pieza | MAX111 | |
| Descripción | Low-Cost / 2-Channel / 14-Bit Serial ADCs | |
| Fabricantes | Maxim Integrated | |
| Logotipo |  |
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19-0283; Rev 5; 11/98
EVAALVUAAILTAIOBNLEKIT
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
General Description
The MAX110/MAX111 analog-to-digital converters
(ADCs) use an internal auto-calibration technique to
achieve 14-bit resolution plus overrange, with no exter-
nal components. Operating supply current is only
550µA (MAX110) and reduces to 4µA in power-down
mode, making these ADCs ideal for high-resolution bat-
tery-powered or remote-sensing applications. A fast
serial interface simplifies signal routing and opto-isola-
tion, saves microcontroller pins, and offers compatibility
with SPI™, QSPI™, and MICROWIRE™. The MAX110
operates with ±5V supplies, and converts differential
analog signals in the -3V to +3V range. The MAX111
operates with a single +5V supply and converts differ-
ential analog signals in the ±1.5V range, or single-
ended signals in the 0V to +1.5V range.
Internal calibration allows for both offset and gain-error
correction under microprocessor (µP) control. Both
devices are available in space-saving 16-pin DIP and
SO packages, as well as an even smaller 20-pin SSOP
package.
________________________Applications
Process Control
Weigh Scales
Panel Meters
Data-Acquisition Systems
Temperature Measurement
Typical Operating Circuit
____________________________Features
o Single +5V Supply (MAX111)
o Two Differential Input Channels
o 14-Bit Resolution Plus Sign and Overrange
o 0.03% Linearity (MAX110)
0.05% Linearity (MAX111)
o Low Power Consumption:
550µA (MAX110)
640µA (MAX111)
4µA Shutdown Current
o Up to 50 Conversions/sec
o 50Hz/60Hz Rejection
o Auto-Calibration Mode
o No External Components Required
o 16-Pin DIP/SO, 20-Pin SSOP
Ordering Information
PART
TEMP. RANGE PIN-PACKAGE INL(%)
MAX110ACPE 0°C to +70°C 16 Plastic DIP ±0.03
MAX110BCPE 0°C to +70°C 16 Plastic DIP ±0.05
MAX110ACWE 0°C to +70°C 16 Wide SO
±0.03
MAX110BCWE 0°C to +70°C 16 Wide SO
±0.05
MAX110ACAP 0°C to +70°C 20 SSOP
±0.03
MAX110BCAP 0°C to +70°C 20 SSOP
±0.05
MAX110BC/D 0°C to +70°C Dice*
±0.05
Ordering Information continued at end of data sheet.
* Contact factory for dice specifications.
Pin Configurations
+5V TOP VIEW
VDD
IN1+ RCSEL
IN1+ 1
REF- 2
16 IN1-
15 IN2+
IN1- MAX110
IN2+ MAX111
REF+ 3
VDD 4
MAX110
MAX111
14 IN2-
13 VSS (AGND)
IN2-
REF+
REF-
CS
RCSEL 5
XCLK 6
SCLK 7
12 GND
11 DIN
10 DOUT
( ) ARE FOR MAX111
SCLK
DIN
VSS
(AGND) DOUT
-5V (0V)
FROM µC
BUSY 8
9 CS
DIP/SO
( ) ARE FOR MAX111
Pin Configurations continued 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 free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
1 page  
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
ELECTRICAL CHARACTERISTICS—MAX111 (continued)
(VDD = 5V ±5%, fXCLK = 1MHz, ÷ 2 mode (DV2 = 1), 81,920 CLK cycles/conv, VREF+ = 1.5V, VREF- = 0V, TA = TMIN to TMAX,
unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
REFERENCE INPUTS
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Differential Reference
Input Voltage Range
VREF
0 1.5 V
Absolute Reference Input
Voltage Range
VREF+,
VREF-
Reference Input Current
IREF+,
IREF-
VREF+ = 1.5V, VREF- = 0V
Reference Input
Capacitance
(Note 3)
CONVERSION TIME
Synchronous Conversion
Time (Note 7)
10,240 clock-cycles/conversion
tCONV
102,400 clock-cycles/conversion
Oversampling Clock
Frequency
fOSC (Note 8)
DIGITAL INPUTS (CS, SCLK, DIN, and XCLK when RCSEL = 0V)
Input High Voltage
VIH
Input Low Voltage
VIL
Input Capacitance
(Note 3)
Input Leakage Current
ILKG Digital inputs at 0V or 5V
DIGITAL OUTPUTS (DOUT, BUSY, and XCLK when RCSEL = VDD)
Output Low Voltage
VOL
DOUT, BUSY, ISINK = 1.6mA
XCLK, ISINK = 200µA
0 VDD - 3.2 V
500 nA
10 pF
20.48
204.80
0.25 1.25
ms
MHz
2.4 V
0.8 V
10 pF
±1 µA
0.4
V
0.4
Output High Voltage
VOH
DOUT, BUSY, VDD = 4.75V, ISOURCE = 1.0mA
XCLK, VDD = 4.75V, ISOURCE = 200µA
VDD - 0.5
VDD - 0.5
Leakage Current
ILKG VOUT = 5V or 0V
Output Capacitance
(Note 3)
POWER REQUIREMENTS (all digital inputs at 0V or 5V)
Positive Supply Voltage
VDD Performance guaranteed by supply rejection test
4.75
Supply Current
Power-Down Current
fXCLK = 500kHz,
continuous-conversion mode
IDD VDD = 5.25V
XCLK unloaded,
continuous-conversion mode, RC
oscillator operational (Note 9)
IDD VDD = 5.25V, VXCLK = 0V, PD = 1
640
960
4
±1
10
5.25
1200
10
V
µA
pF
V
µA
µA
_______________________________________________________________________________________ 5
5 Page 
Low-Cost, 2-Channel, ±14-Bit Serial ADCs
+5V
VDD
RCSEL
TTL/CMOS
MAX110
MAX111
GND
XCLK
VSS (AGND)
-5V (0V)
( ) ARE FOR MAX111.
Figure 3a. Connection for External-Clock Mode
+5V
VDD
RCSEL
+5V
1MΩ
MAX110
MAX111
GND
XCLK
VSS (AGND)
-5V (0V)
( ) ARE FOR MAX111.
Figure 3b. Connection for Internal RC-Oscillator Mode—XCLK
connects to the internal RC oscillator. Note, the pull-up resistor
is not necessary if the internal oscillator is never shut down.
ADC Operation
The output data from the MAX110/MAX111 is arranged
in twos-complement format (Figures 4, 5). The sign bit
(POL) is shifted out first, followed by the overrange bit
(OR), and the 14 data bits (MSB first) (see Figure 6).
The MAX110 operates from ±5V power supplies and
converts low-frequency analog signals in the ±3V
range when using the maximum reference voltage of
VREF = 3V (VREF = VREF+ - VREF-). Within the ±3V input
range, greater accuracy is obtained within ±2.5V (see
Electrical Characteristics for details). Note that a nega-
tive input voltage is defined as VIN- > VIN+. For the
MAX110, the absolute voltage at any analog input pin
must remain within the (VSS + 2.25V) to (VDD - 2.25V)
range.
The MAX111 operates from a single +5V supply and
converts low-frequency differential analog signals in the
±1.5V range when using the maximum reference volt-
age of VREF = 1.5V. As indicated in the Electrical
Characteristics, greater accuracy is achieved within the
±1.2V range. The absolute voltage at any analog input
pin for the MAX111 must remain within 0V to VDD - 3.2V.
When VIN- > VIN+ the input is interpreted as negative.
The overrange bit (OFL) is provided to sense when the
input voltage level has exceeded the reference voltage
level. The converter does not “saturate” until the input
voltage is typically 20% larger. The linearity is not guar-
anteed in this range. Note that the overrange bit works
properly if the reference voltage remains within the rec-
ommended voltage range (see Reference Inputs). If the
reference voltage exceeds the recommended input
range, the overrange bit may not operate properly.
Digital Interface—Starting a Conversion
Data is transferred into and out of the serial I/O shift
register by pulling CS low and applying a serial clock
at SCLK. This fully static shift register allows SCLK to
range from DC to 2MHz. Output data from the ADC is
clocked out on SCLK’s falling edge and should be read
on SCLK’s rising edge. Input data to the ADC at DIN is
clocked in on SCLK’s rising edge. A new conversion
begins when CS returns high, provided the MSB in the
input control word (NO-OP) is a 1 (see Using the
MAX110/MAX111 with MICROWIRE, SPI, and QSPI
Serial Interfaces). Figure 6 shows the detailed serial-
interface timing diagram.
CS must remain high during the conversion (while
BUSY remains low). Bringing CS low during the conver-
sion causes the ADC to stop converting, and may
result in erroneous output data.
Using the MAX110/MAX111 with SPI, QSPI, and
MICROWIRE Serial Interfaces
Figure 7 shows the most common serial-interface con-
nections. The MAX110/MAX111 are compatible with
SPI, QSPI (CPHA = 0, CPOL = 0), and MICROWIRE
serial-interface standards.
______________________________________________________________________________________ 11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet MAX111.PDF ] | |
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