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PDF MAX1498 Data sheet ( Hoja de datos )

Número de pieza MAX1498
Descripción (MAX1447 - MAX1498) Single-Chip ADCs
Fabricantes Maxim Integrated Products 
Logotipo Maxim Integrated Products Logotipo



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No Preview Available ! MAX1498 Hoja de datos, Descripción, Manual

19-3166; Rev 0; 1/04
3.5- and 4.5-Digit, Single-Chip ADCs
with LED Drivers
General Description
The MAX1447/MAX1496/MAX1498 low-power, 3.5- and
4.5-digit, analog-to-digital converters (ADCs) with inte-
grated light-emitting diode (LED) drivers operate from a
single 2.7V to 5.25V power supply. They include an
internal reference, a high-accuracy on-chip oscillator,
and a multiplexed LED display driver. An internal charge
pump generates the negative supply needed to power
the integrated input buffers for single-supply operation.
The ADC is configurable for either a ±2V or ±200mV
input range and it outputs its conversion results to an
LED. The MAX1496 is a 3.5-digit (±1999 count) device
and the MAX1447/MAX1498 are 4.5-digit (±19,999
count) devices.
The MAX1447/MAX1496/MAX1498 do not require exter-
nal precision integrating capacitors, autozero capaci-
tors, crystal oscillators, charge pumps, or other circuitry
required with dual-slope ADCs (commonly used in
panel meter circuits).
These devices also feature on-chip buffers for the dif-
ferential signal and reference input, allowing direct
interface with high-impedance signal sources. In addi-
tion, they use continuous internal offset-calibration and
offer >100dB rejection of 50Hz and 60Hz line noise.
Other features include data hold and peak detection
and overrange/underrange detection. The MAX1447
features on-demand enhanced offset calibration for
improved offset performance.
The MAX1447/MAX1498 are available in a 32-pin, 7mm
7mm TQFP package and the MAX1496 is available in
28-pin SSOP and 28-pin PDIP packages. All devices in
this family operate over the -40°C to +85°C extended
temperature range.
Digital Panel Meters
Hand-Held Meters
Digital Voltmeters
Digital Multimeters
Applications
Pin Configurations appear at end of data sheet.
Features
High Resolution
MAX1447/MAX1498: 4.5 Digits (±19,999 Count)
MAX1496: 3.5 Digits (±1999 Count)
Sigma-Delta ADC Architecture
No Integrating Capacitors Required
No Autozeroing Capacitors Required
>100dB of Simultaneous 50Hz and 60Hz
Rejection
Selectable Input Range of ±200mV or ±2V
Selectable Voltage Reference: Internal 2.048V or
External
Internal High-Accuracy Oscillator Needs No
External Components
Automatic Offset Calibration
On-Demand Enhanced Offset Calibration
(MAX1447)
Operate from a Single 2.7V to 5.25V Supply
Low Power (Exclude LED-Driver Current)
Maximum 744µA Operating Current (MAX1496)
Maximum 960µA Operating Current
(MAX1447/MAX1498)
Maximum 325µA Shutdown Currentwww.DataSheet.co.kr
Multiplexed Common-Cathode LED Drivers
Resistor-Programmable Segment Current
Small 32-Pin, 7mm x 7mm TQFP Package (4.5
Digits), 28-Pin SSOP Package (3.5 Digits)
Also Available in a PDIP Package (3.5 Digits)
Ordering Information
PART
TEMP RANGE
PIN-
PACKAGE
RESOLUTION
(DIGITS)
MAX1447ECJ
MAX1496EAI*
MAX1496EPI
MAX1498ECJ
-40°C to +85°C 32 TQFP
-40°C to +85°C 28 SSOP
-40°C to +85°C 28 PDIP
-40°C to +85°C 32 TQFP
4.5
3.5
3.5
4.5
*Future product—contact factory for availability.
________________________________________________________________ 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.
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1 page




MAX1498 pdf
3.5- and 4.5-Digit, Single-Chip ADCs
with LED Drivers
ELECTRICAL CHARACTERISTICS (continued)
(AVDD = DVDD = VDD = +2.7V to +5.25V, GND = 0, VLED = +2.7V to +5.25V, GLED = 0, VREF+ - VREF- = 2.048V (external reference),
CREF+ = CREF- = 0.1µF, CVNEG = 0.1µF. Internal clock mode, unless otherwise noted. All specifications are at TA = TMIN to TMAX.
Typical values are at TA = +25°C, unless otherwise noted.)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
LED DRIVERS (Table 5)
LED Supply Voltage
LED Shutdown Supply Current
VLED
ISHDN
LED driver shutdown mode
2.70
5.25 V
10 µA
LED Supply Current
ILED
Seven segments and decimal point on,
RISET = 25k
176 180
mA
Display Scan Rate
fOSC
MAX1447/MAX1498
MAX1496
512
Hz
640
Segment Current Slew Rate
DIG_ Voltage Low
ISEG/t
VDIG IDIG_ = 176mA
25
0.178 0.300
mA/µs
V
Segment Drive Source Current
Matching
ISEG
3 ±10
%
Segment Drive Source Current
Interdigit Blanking Time
ISEG VLED - VSEG = 0.6V, RISET = 25k
16.0 21.5 25.5
4
mA
µs
Note 1: Integral nonlinearity is the deviation of the analog value at any code from its theoretical value after nulling the gain error and
offset error.
Note 2: Offset calibrated.
Note 3: Offset nulled.
www.DataSheet.co.kr
Note 4: Drift error is eliminated by recalibration at the new temperature.
Note 5: The input voltage range for the analog inputs is given with respect to the voltage on the negative input of the differential pair.
Note 6: VAIN+ or VAIN- = -2.2V to +2.2V. VREF+ or VREF- = -2.2V to +2.2V. All input structures are identical. Production tested on
AIN+ and REF+ only.
Note 7: Power-supply currents are measured with all digital inputs at either GND or DVDD.
Note 8: Measured at DC by changing the power-supply voltage from 2.7V to 5.25V and measuring the effect on the conversion
error with external reference. PSRR at 50Hz and 60Hz exceeds 120dB with filter notches at 50Hz and 60Hz (Figure 2).
Note 9: LED drivers are disabled.
_______________________________________________________________________________________ 5
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5 Page





MAX1498 arduino
3.5- and 4.5-Digit, Single-Chip ADCs
with LED Drivers
AVDD DVDD
ISET VLED
+2.5V
TIMING
AIN+
AIN-
INPUT
BUFFERS
REF+
BINARY-TO-
ADC BCD
CONVERTERS
LED
DRIVER
REF- OSCILLATOR
CLOCK
-2.5V
+2.5V
-2.5V
2.048V
BANDGAP
REFERENCE
A = 1.22
CHARGE
PUMP
MAX1447
MAX1498
SEG1
SEGF
SEGDP
DIG0
DIG4
LED_EN
GLED
CLK
DPON
DPSET1
DPSET2
RANGE
PEAK
HOLD
GND
Figure 1. MAX1447/MAX1498 Functional Diagram
www.DataSheet.co.kr
VNEG
Modulator
The MAX1447/MAX1496/MAX1498 perform analog-to-
digital conversions using a single-bit, 3rd-order, sigma-
delta modulator. The sigma-delta modulator converts
the input signal into a digital pulse train whose average
duty cycle represents the digitized signal information.
The modulator quantizes the input signal at a much
higher sample rate than the bandwidth of the input.
The MAX1447/MAX1496/MAX1498 modulator provides
3rd-order frequency shaping of the quantization noise
resulting from the single-bit quantizer. The modulator is
fully differential for maximum signal-to-noise ratio and
minimum susceptibility to power-supply noise. A single-
bit data stream is then presented to the digital filter to
remove the frequency-shaped quantization noise.
Digital Filtering
The MAX1447/MAX1496/MAX1498 contain an on-chip
digital lowpass filter that processes the data stream
from the modulator using a SINC4 response:
sin(x) 4
 x 
The SINC4 filter has a settling time of four output data
periods (4 x 200ms).
The MAX1447/MAX1496/MAX1498 have 25% over-
range capability built into the modulator and digital fil-
ter. The digital filter is optimized for the fCLK equal to
4.9152MHz. The frequency response of the SINC4 filter is
calculated as follows:
H(z)
=

1
N
(1
(1
-
-
Z-N)
Z-1)
4

H(f)
=
1
N

sinNπ
f
fm
sin
πf
fm


4

where N is the oversampling ratio, and fm = N x output
data rate = 5Hz.
______________________________________________________________________________________ 11
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