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PDF MAX1229 Data sheet ( Hoja de datos )

Número de pieza MAX1229
Descripción 12-Bit 300ksps ADCs with FIFO / Temp Sensor / Internal Reference
Fabricantes Maxim Integrated 
Logotipo Maxim Integrated Logotipo



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No Preview Available ! MAX1229 Hoja de datos, Descripción, Manual

19-2852; Rev 1; 7/03
EVAALVUAAILTAIOBNLEKIT
12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
General Description
The MAX1226/MAX1228/MAX1230 are serial 12-bit ana-
log-to-digital converters (ADCs) with an internal reference
and an internal temperature sensor. These devices fea-
ture on-chip FIFO, scan mode, internal clock mode, inter-
nal averaging, and AutoShutdown™. The maximum
sampling rate is 300ksps using an external clock. The
MAX1230 has 16 input channels, the MAX1228 has 12
input channels, and the MAX1226 has 8 input channels.
All input channels are configurable for single-ended or
differential inputs in unipolar or bipolar mode. All three
devices operate from a +5V supply and contain a 10MHz
SPI™/QSPI™/MICROWIRE™-compatible serial port.
The MAX1230 is available in 28-pin 5mm x 5mm QFN
with exposed pad and 24-pin QSOP packages. The
MAX1226/MAX1228 are only available in QSOP pack-
ages. All three devices are specified over the extended
-40°C to +85°C temperature range.
________________________Applications
System Supervision
Data-Acquisition Systems
Industrial Control Systems
Patient Monitoring
Data Logging
Instrumentation
Features
o Internal Temperature Sensor (±1°C Accuracy)
o 16-Entry First-In/First-Out (FIFO)
o Analog Multiplexer with True Differential
Track/Hold
16-, 12-, 8-Channel Single Ended
8-, 6-, 4-Channel True Differential
(Unipolar or Bipolar)
o Accuracy: ±1 LSB INL, ±1 LSB DNL, No Missing
Codes Over Temperature
o Scan Mode, Internal Averaging, and Internal Clock
o Low-Power Single +5V Operation
1.9mA at 300ksps
o Internal 4.096V Reference or External Differential
Reference
o 10MHz 3-Wire SPI/QSPI/MICROWIRE-Compatible
Interface
o Space-Saving 28-Pin 5mm x 5mm QFN Package
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX1226ACEE-T*
MAX1226AEEE-T*
0°C to +70°C
-40°C to +85°C
16 QSOP
16 QSOP
*Future product—contact factory for availability.
AutoShutdown is a trademark of Maxim Integrated Products, Inc.
SPI/QSPI are trademarks of Motorola, Inc.
MICROWIRE is a trademark of National Semiconductor Corp.
Ordering Information continued at end of data sheet.
Pin Configurations
TOP VIEW
AIN0 1
AIN1 2
AIN2 3
AIN3 4
AIN4 5
AIN5 6
REF-/AIN6 7
CNVST/AIN7 8
MAX1226
16 EOC
15 DOUT
14 DIN
13 CS
12 SCLK
11 VDD
10 GND
9 REF+
QSOP
Pin Configurations continued at end of data sheet.
AIN0 1
AIN1 2
AIN2 3
AIN3 4
AIN4 5
AIN5 6
AIN6 7
AIN7 8
AIN8 9
AIN9 10
MAX1228
20 EOC
19 DOUT
18 DIN
17 CS
16 SCLK
15 VDD
14 GND
13 REF+
12 CNVST/AIN11
11 REF-/AIN10
QSOP
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

1 page




MAX1229 pdf
12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
TIMING CHARACTERISTICS (Figure 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
SCLK Clock Period
Externally clocked conversion
tCP
Data I/O
208
100
ns
SCLK Duty Cycle
SCLK Fall to DOUT Transition
CS Rise to DOUT Disable
CS Fall to DOUT Enable
DIN to SCLK Rise Setup
SCLK Rise to DIN Hold
CS to SCLK Rise Setup
SCLK Rise to CS Hold
CNVST Pulse Width
tCH
tDOT
tDOD
tDOE
tDS
tDH
tCSS
tCSH
tCSW
CLOAD = 30pF
CLOAD = 30pF
CLOAD = 30pF
CKSEL = 00, CKSEL = 01 (temp sense)
CKSEL = 01 (voltage conversion)
40
0
0
40
1.4
60 %
40 ns
40 ns
40 ns
40 ns
ns
40 ns
ns
ns
µs
CS or CNVST Rise to EOC
Low (Note 9)
tTS Temp sense
Voltage conversion
tRP Reference power-up
55
7 µs
65
Note 9: This time is defined as the number of clock cycles needed for conversion multiplied by the clock period. If the internal refer-
ence needs to be powered up, the total time is additive. The internal reference is always used for temperature measurements.
Typical Operating Characteristics
(VDD = +5V, VREF = +4.096V, fSCLK = 4.8MHz, CLOAD = 30pF, TA = +25°C, unless otherwise noted.)
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
INTEGRAL NONLINEARITY
vs. OUTPUT CODE
1024 2048 3072
OUTPUT CODE
4096
1.0
0.8
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
-0.8
-1.0
0
DIFFERENTIAL NONLINEARITY
vs. OUTPUT CODE
1024 2048 3072
OUTPUT CODE
4096
100
90
80
70
60
50
40
30
20
10
0
0.1
SINAD vs. FREQUENCY
1 10 100
FREQUENCY (kHz)
1000
_______________________________________________________________________________________ 5

5 Page





MAX1229 arduino
12-Bit 300ksps ADCs with FIFO,
Temp Sensor, Internal Reference
AIN0-AIN15
(SINGLE ENDED);
AIN0, AIN2,
AIN4…AIN14
(DIFFERENTIAL)
HOLD
GND
(SINGLE ENDED);
AIN1, AIN3,
AIN5…AIN15
(DIFFERENTIAL)
REF
GND DAC
CIN+
CIN-
HOLD
VDD/2
COMPARATOR
+
-
HOLD
Figure 3. Equivalent Input Circuit
appropriate bit of the bipolar or unipolar register.
Unipolar mode sets the differential input range from 0 to
VREF. A negative differential analog input in unipolar
mode causes the digital output code to be zero.
Selecting bipolar mode sets the differential input range
to ±VREF / 2. The digital output code is binary in unipo-
lar mode and twos complement in bipolar mode. (See
the transfer function graphs, Figures 8 and 9.)
In single-ended mode, the MAX1226/MAX1228/
MAX1230 always operate in unipolar mode. The analog
inputs are internally referenced to GND with a full-scale
input range from 0 to VREF.
True Differential Analog Input T/H
The equivalent circuit of Figure 3 shows the
MAX1226/MAX1228/MAX1230sinput architecture. In
track mode, a positive input capacitor is connected to
AIN0AIN15 in single-ended mode (and AIN0, AIN2,
AIN4AIN14 in differential mode). A negative input
capacitor is connected to GND in single-ended mode
(or AIN1, AIN3, AIN5AIN15 in differential mode). For
external track-and-hold timing, use clock mode 01.
After the T/H enters hold mode, the difference between
the sampled positive and negative input voltages is
converted. The time required for the T/H to acquire an
input signal is determined by how quickly its input
capacitance is charged. If the input signals source
impedance is high, the required acquisition time length-
ens. The acquisition time, tACQ, is the maximum time
needed for a signal to be acquired, plus the power-up
time. It is calculated by the following equation:
( )tAQC = 9 x RS + RIN x 24pF + tPWR
where RIN = 1.5k, RS is the source impedance of the
input signal, and tPWR = 1µs, the power-up time of the
device. The varying power-up times are detailed in the
explanation of the clock mode conversions.
tACQ is never less than 1.4µs, and any source imped-
ance below 300does not significantly affect the
ADCs AC performance. A high-impedance source can
be accommodated either by lengthening tACQ or by
placing a 1µF capacitor between the positive and neg-
ative analog inputs.
Internal FIFO
The MAX1226/MAX1228/MAX1230 contain a FIFO
buffer that can hold up to 16 ADC results plus one tem-
perature result. This allows the ADC to handle multiple
internally clocked conversions and a temperature mea-
surement, without tying up the serial bus.
If the FIFO is filled and further conversions are request-
ed without reading from the FIFO, the oldest ADC
results are overwritten by the new ADC results. Each
result contains 2 bytes, with the MSB preceded by 4
leading zeros. After each falling edge of CS, the oldest
available byte of data is available at DOUT, MSB first.
When the FIFO is empty, DOUT is zero.
The first 2 bytes of data read out after a temperature mea-
surement always contain the temperature result preceded
by 4 leading zeros, MSB first. If another temperature mea-
surement is performed before the first temperature result
is read out, the old measurement is overwritten by the
new result. Temperature results are in degrees Celsius
(twos complement) at a resolution of 1/8 of degree. See
the Temperature Measurements section for details on
converting the digital code to a temperature.
Internal Clock
The MAX1226/MAX1228/MAX1230 operate from an inter-
nal oscillator, which is accurate within 10% of the 4.4MHz
nominal clock rate. The internal oscillator is active in clock
modes 00, 01, and 10. Read out the data at clock speeds
up to 10MHz. See Figures 47 for details on timing speci-
fications and starting a conversion.
Applications Information
Register Descriptions
The MAX1226/MAX1228/MAX1230 communicate
between the internal registers and the external circuitry
through the SPI-/QSPI-compatible serial interface.
Table 1 details the registers and the bit names. Tables
27 show the various functions within the conversion
register, setup register, averaging register, reset regis-
ter, unipolar register, and bipolar register.
______________________________________________________________________________________ 11

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