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Número de pieza | MAX1495 | |
Descripción | 3.5- and 4.5-Digit / Single-Chip ADCs | |
Fabricantes | Maxim Integrated | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de MAX1495 (archivo pdf) en la parte inferior de esta página. Total 25 Páginas | ||
No Preview Available ! 19-3053; Rev 2; 5/04
EVAALVUAAILTAIOBNLEKIT
3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
General Description
The MAX1491/MAX1493/MAX1495 low-power, 3.5- and
4.5-digit, analog-to-digital converters (ADCs) with inte-
grated liquid crystal display (LCD) drivers operate from a
single 2.7V to 5.25V power supply. They include an inter-
nal reference, a high-accuracy on-chip oscillator, and a
triplexed LCD driver. An internal charge pump generates
the negative supply needed to power the integrated input
buffer for single supply operation. The ADC is config-
urable for either a ±2V or ±200mV input range and it out-
puts its conversion results to an LCD. The MAX1491 is a
3.5-digit (±1999 count) device, and the MAX1493/
MAX1495 are 4.5-digit (±19,999 count) devices.
The MAX1491/MAX1493/MAX1495 do not require exter-
nal-precision integrating or auto-zero capacitors, 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 differential signal and reference inputs, allowing
direct interface with high-impedance signal sources. In
addition, the MAX1491/MAX1493/MAX1495 use continu-
ous internal offset calibration, and offer >100dB rejec-
tion of 50Hz and 60Hz line noise. The MAX1493/
MAX1495 perform enhanced offset calibration at power-
up. The MAX1495 also performs enhanced calibration
on demand. Other features include data hold and peak
hold, and a user programmable low-battery monitor.
The MAX1493/MAX1495 come in a 32-pin 7mm ✕ 7mm
TQFP package, and the MAX1491 comes in 28-pin
SSOP and 28-pin DIP packages. All devices in this fam-
ily operate over the 0°C to +70°C commercial tempera-
ture range.
Digital Panel Meters
Hand-Held Meters
Digital Voltmeters
Digital Multimeters
Applications
Ordering Information
PART
MAX1491CAI
MAX1491CNI
MAX1493CCJ
MAX1495CCJ
TEMP
RANGE
PIN-
PACKAGE
0°C to +70°C 28 SSOP
0°C to +70°C 28 DIP
0°C to +70°C 32 TQFP
0°C to +70°C 32 TQFP
RESOLUTION
(DIGITS)
3.5
3.5
4.5
4.5
Features
♦ High Resolution
MAX1495: 4.5 Digits (±19,999 Count)
MAX1493: 4.5 Digits (±19,999 Count)
MAX1491: 3.5 Digits (±1999 Count)
♦ Sigma-Delta ADC Architecture
No Integrating Capacitors Required
No Autozeroing Capacitors Required
>100dB of Simultaneous 50Hz and 60Hz Rejection
♦ Operate from a Single 2.7V or 5.25V Supply
♦ 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
♦ Low Power: Maximum 980µA Operating Current
♦ Small 32-Pin 7mm ✕ 7mm TQFP Package (4.5
Digits), 28-Pin SSOP Package (3.5 Digits), and 28-
Pin DIP Package (3.5 Digits)
♦ Triplexed LCD Driver
♦ Evaluation Kit Available (Order MAX1494EVKIT)
Pin Configurations
TOP VIEW
AVDD 1
AIN+ 2
AIN- 3
REF- 4
REF+ 5
LOWBATT 6
RANGE 7
DPSET1 8
32 31 30 29 28 27 26 25
MAX1493
MAX1495
24 SEG13
23 SEG12
22 SEG11
21 SEG10
20 SEG9
19 SEG8
18 SEG7
17 SEG6
9 10 11 12 13 14 15 16
TQFP
Pin Configurations continued at end of data sheet.
________________________________________________________________ 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 3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
Typical Operating Characteristics
(AVDD = DVDD = 5V, GND = 0, REF+ = 2.048V, REF- = GND, RANGE = DVDD, TA = +25°C.)
MAX1493/MAX1495 (±200mV INPUT RANGE)
INL vs. DISPLAY COUNT
1.0
MAX1493/MAX1495 (±2V INPUT RANGE)
INL vs. DISPLAY COUNT
1.0
0.5 0.5
00
-0.5 -0.5
-1.0
-20,000
-10,000 0 10,000
DISPLAY COUNT
20,000
-1.0
-20,000
-10,000 0 10,000
DISPLAY COUNT
20,000
NOISE DISTRIBUTION
25
20
15
10
5
0
-0.2-0.1 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
NOISE (COUNTS)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
700
600
500 ANALOG SUPPLY
400
300
DIGITAL SUPPLY
200
100
0
2.75
3.25 3.75 4.25 4.75
SUPPLY VOLTAGE (V)
5.25
MAX1493/MAX1495
GAIN ERROR vs. SUPPLY VOLTAGE
0.08
0.06
0.04
0.02
0
-0.02
-0.04
-0.06
-0.08
-0.10
2.75
3.25 3.75 4.25 4.75
SUPPLY VOLTAGE (V)
5.25
0
-0.01
-0.02
-0.03
-0.04
-0.05
-0.06
-0.07
-0.08
-0.09
-0.10
0
MAX1493/MAX1495
GAIN ERROR vs. TEMPERATURE
10 20 30 40 50 60 70
TEMPERATURE (°C)
_______________________________________________________________________________________ 5
5 Page 3.5- and 4.5-Digit, Single-Chip
ADCs with LCD Drivers
HOLD
PEAK
LOW BATT
BP1
BP2
Figure 4. Backplane Connection for the MAX1493/MAX1495 (4.5 Digits)
BP3
SEG13: PEAK, HOLD, N.C.
HOLD
PEAK
LOW BATT
SEG2: A1, G1, D1
ANNUNCIATOR
SEG12: F4, E4, DP4
SEG11: A4, G4, D4
SEG10: B4, C4, BC5
SEG9: F3, E3, DP3
SEG8: A3, G3, D3
SEG1: B1, C1, ANNUNCIATOR
SEG3: F1, E1, DP1
SEG4: B2, C2, LOWBATT
SEG5: A2, G2, D2
SEG6: F2, E2, DP2
SEG7: B3, C3, MINUS
Figure 5. Segment Connection for the MAX1493/MAX1495 (4.5 Digits)
______________________________________________________________________________________ 11
11 Page |
Páginas | Total 25 Páginas | |
PDF Descargar | [ Datasheet MAX1495.PDF ] |
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