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PDF MAX1076 Data sheet ( Hoja de datos )

Número de pieza MAX1076
Descripción (MAX1076 / MAX1078) 10-Bit ADCs
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! MAX1076 Hoja de datos, Descripción, Manual

19-3291; Rev 1; 4/09
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1.8Msps, Single-Supply, Low-Power, True-
Differential, 10-Bit ADCs with Internal Reference
General Description
The MAX1076/MAX1078 are low-power, high-speed, seri-
al-output, 10-bit, analog-to-digital converters (ADCs) that
operate at up to 1.8Msps and have an internal reference.
These devices feature true-differential inputs, offering bet-
ter noise immunity, distortion improvements, and a wider
dynamic range over single-ended inputs. A standard
SPI™/QSPI™/MICROWIRE™ interface provides the clock
necessary for conversion. These devices easily interface
with standard digital signal processor (DSP) synchronous
serial interfaces.
The MAX1076/MAX1078 operate from a single +4.75V to
+5.25V supply voltage. The MAX1076/MAX1078 include
a 4.096V internal reference. The MAX1076 has a unipolar
analog input, while the MAX1078 has a bipolar analog
input. These devices feature a partial power-down mode
and a full power-down mode for use between conver-
sions, which lower the supply current to 2mA (typ) and
1µA (max), respectively. Also featured is a separate
power-supply input (VL), which allows direct interfacing to
+1.8V to VDD digital logic. The fast conversion speed,
low-power dissipation, excellent AC performance, and DC
accuracy (±0.5 LSB INL) make the MAX1076/MAX1078
ideal for industrial process control, motor control, and
base-station applications.
The MAX1076/MAX1078 come in a 12-pin TQFN pack-
age, and are available in the extended (-40°C to +85°C)
temperature range.
Data Acquisition
Bill Validation
Motor Control
Applications
Communications
Portable Instruments
Features
o 1.8Msps Sampling Rate
o Only 50mW (typ) Power Dissipation
o Only 1µA (max) Shutdown Current
o High-Speed, SPI-Compatible, 3-Wire Serial Interface
o 61dB S/(N + D) at 525kHz Input Frequency
o Internal True-Differential Track/Hold (T/H)
o Internal 4.096V Reference
o No Pipeline Delays
o Small 12-Pin TQFN Package
Ordering Information
PART
TEMP RANGE PIN-
PACKAGE
INPUT
MAX1076ETC+T -40°C to +85°C 12 TQFN
Unipolar
MAX1078ETC+T -40°C to +85°C 12 TQFN
Bipolar
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
Pin Configuration
Typical Operating Circuit
TOP VIEW
AIN+ N.C. SCLK
12 11 10
AIN- 1
REF 2
RGND 3
MAX1076
MAX1078
9 CNVST
8 DOUT
7 VL
456
VDD N.C. GND
TQFN
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
+4.75V TO +5.25V
+1.8V TO VDD
10μF
DIFFERENTIAL +
INPUT
VOLTAGE -
4.7μF 0.01μF
0.01μF
VDD
0.01μF
VL
AIN+ DOUT
AIN-
MAX1076
MAX1078 CNVST
SCLK
REF
RGND
GND
10μF
μC/DSP
________________________________________________________________ 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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MAX1076 pdf
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1.8Msps, Single-Supply, Low-Power, True-
Differential, 10-Bit ADCs with Internal Reference
Typical Operating Characteristics
(VDD = +5V, VL = VDD, fSCLK = 28.8MHz, fSAMPLE = 1.8Msps, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA =
+25°C.)
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODE (MAX1076)
0.2
INTEGRAL NONLINEARITY
vs. DIGITAL OUTPUT CODE (MAX1078)
0.2
DIFFERENTIAL NONLINEARITY
vs. DIGITAL OUTPUT CODE (MAX1076)
0.2
0.1 0.1 0.1
0 00
-0.1 -0.1 -0.1
-0.2
0
256 512 756
DIGITAL OUTPUT CODE
1024
DIFFERENTIAL NONLINEARITY
vs. DIGITAL OUTPUT CODE (MAX1078)
0.2
-0.2
-512
-256 0
256
DIGITAL OUTPUT CODE
512
OFFSET ERROR
vs. TEMPERATURE (MAX1076)
0.50
-0.2
0
256 512 756
DIGITAL OUTPUT CODE
1024
OFFSET ERROR
vs. TEMPERATURE (MAX1078)
0.50
0.1 0.25
0.25
00
0
-0.1 -0.25
-0.25
-0.2
-512
-256 0 256
DIGITAL OUTPUT CODE
512
GAIN ERROR
vs. TEMPERATURE (MAX1076)
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
-40
-15 10 35 60
TEMPERATURE (°C)
85
-0.50
-40
-15 10 35 60
TEMPERATURE (°C)
85
GAIN ERROR
vs. TEMPERATURE (MAX1078)
1.00
0.75
0.50
0.25
0
-0.25
-0.50
-0.75
-1.00
-40
-15 10 35 60
TEMPERATURE (°C)
85
-0.50
-40
-15 10 35 60
TEMPERATURE (°C)
85
DYNAMIC PERFORMANCE
vs. INPUT FREQUENCY (MAX1076)
61.6
61.5 SNR
61.4
61.3 SINAD
61.2
61.1
61.0
100
200 300 400
ANALOG INPUT FREQUENCY (kHz)
500
_______________________________________________________________________________________ 5

5 Page





MAX1076 arduino
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1.8Msps, Single-Supply, Low-Power, True-
Differential, 10-Bit ADCs with Internal Reference
Applications Information
Internal Reference
The MAX1076/MAX1078 have an on-chip voltage refer-
ence trimmed to 4.096V. The internal reference output
is connected to REF and also drives the internal capac-
itive DAC. The output can be used as a reference volt-
age source for other components and can source up to
2mA. Bypass REF with a 0.01µF capacitor and a 4.7µF
capacitor to RGND.
The internal reference is continuously powered up dur-
ing both normal and partial power-down modes. In full
power-down mode, the internal reference is disabled.
Be sure to allow at least 2ms recovery time after hard-
ware power-up or exiting full power-down mode for the
reference to reach its intended value.
How to Start a Conversion
An analog-to-digital conversion is initiated by CNVST
and clocked by SCLK, and the resulting data is clocked
out on DOUT by SCLK. With SCLK idling high or low, a
falling edge on CNVST begins a conversion. This causes
the analog input stage to transition from track to hold
mode, and DOUT to transition from high impedance to
being actively driven low. A total of 16 SCLK cycles are
required to complete a normal conversion. If CNVST is
low during the 16th falling SCLK edge, DOUT returns to
high impedance on the next rising edge of CNVST or
SCLK, enabling the serial interface to be shared by multi-
ple devices. If CNVST returns high after the 14th, but
before the 16th SCLK rising edge, DOUT remains active
so continuous conversions can be sustained. The high-
est throughput is achieved when performing continuous
conversions. Figure 10 illustrates a conversion using a
typical serial interface.
Connection to
Standard Interfaces
The MAX1076/MAX1078 serial interface is fully compati-
ble with SPI/QSPI and MICROWIRE (see Figure 11). If a
serial interface is available, set the CPU’s serial interface
in master mode so the CPU generates the serial clock.
Choose a clock frequency up to 28.8MHz.
SPI and MICROWIRE
When using SPI or MICROWIRE, the MAX1076/MAX1078
are compatible with all four modes programmed with the
CPHA and CPOL bits in the SPI or MICROWIRE control
register. Conversion begins with a CNVST falling edge.
DOUT goes low, indicating a conversion is in progress.
Two consecutive 1-byte reads are required to get the full
10 bits from the ADC. DOUT transitions on SCLK rising
edges. DOUT is guaranteed to be valid tDOUT later and
OUTPUT CODE
011...111
011...110
000...010
000...001
000...000
111...111
111...110
111...101
FS = VREF
2
ZS = 0
- FS = -VREF
2
1 LSB = VREF
1024
FULL-SCALE
TRANSITION
100...001
100...000
-FS 0 FS
DIFFERENTIAL INPUT
FS - 3/2 LSB
VOLTAGE (LSB)
Figure 8. Unipolar Transfer Function (MAX1076 Only)
OUTPUT CODE
011...111
011...110
000...010
000...001
000...000
111...111
111...110
111...101
FS = VREF
2
ZS = 0
- FS = -VREF
2
1 LSB = VREF
1024
FULL-SCALE
TRANSITION
100...001
100...000
-FS 0 FS
DIFFERENTIAL INPUT
FS - 3/2 LSB
VOLTAGE (LSB)
Figure 9. Bipolar Transfer Function (MAX1078 Only)
______________________________________________________________________________________ 11

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