參數(shù)資料
型號(hào)： MAX1499ECJ
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： ADC
英文描述： 3.5- and 4.5-Digit, Single-Chip ADCs with LED Drivers and レC Interface
中文描述： 1-CH PROPRIETARY METHOD ADC, PQFP32
封裝： 7 X 7 MM, 1.40 MM HEIGHT, MO-136BC, TQFP-32
文件頁(yè)數(shù)： 11/33頁(yè)
文件大?。?/td> 665K
代理商： MAX1499ECJ
M
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and μC Interface
______________________________________________________________________________________
11
Detailed Description
The MAX1497/MAX1499 low-power, highly integrated
ADCs with LED drivers convert a ±2V differential input
voltage (one count is equal to 100μV for the MAX1499
and 1mV for the MAX1497) with a sigma-delta ADC and
output the result to an LED or μC. An additional
±200mV input range (one count is equal to 10μV for the
MAX1499 and 100μV for the MAX1497) is available to
measure small signals with increased resolution.
The devices operate from a single 2.7V to 5.25V power
supply and offer 3.5-digit (MAX1497) or 4.5-digit
(MAX1499) conversion results. An internal 2.048V refer-
ence, internal charge pump, and a high-accuracy on-
chip oscillator eliminate external components.
The MAX1497/MAX1499 interface with a μC using an
SPI-/QSPI-/MICROWIRE-compatible serial interface.
Data can either be sent directly to the display or to the
μC first for processing before being displayed.
The devices also feature on-chip buffers for the differ-
ential input signal and external reference inputs, allow-
ing direct interface with high-impedance signal
sources. In addition, they use continuous internal offset-
calibration and offer >100dB of 50Hz and 60Hz line
noise rejection. Other features include data hold and
peak detection, overrange and underrange detection.
The MAX1499 also provides a low-battery monitor.
Analog Input Protection
Internal protection diodes limit the analog input range
from VNEG to (AV
DD
+ 0.3V) for the MAX1499, and
from VNEG to (V
DD
to 0.3V) for the MAX1497. If the
analog input exceeds this range, limit the input current
to 10mA.
Internal Analog Input/Reference Buffers
The MAX1497/MAX1499 analog input/reference buffers
allow the use of high-impedance signal sources. The
input buffers’ common-mode input range allows the ana-
log inputs and the reference to range from -2.2V to +2.2V.
Modulator
The MAX1497/MAX1499 perform analog-to-digital con-
versions using a single-bit, 3rd-order, sigma-delta mod-
ulator. 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 MAX1497/MAX1499 modulator provides 3rd-order
frequency shaping of the quantization noise resulting
from the single-bit quantizer. The modulator is fully dif-
ferential for maximum signal-to-noise ratio and mini-
mum susceptibility to power-supply noise. A single-bit
data stream is then presented to the digital filter to
remove the frequency-shaped quantization noise.
Pin Description (continued)
PIN
MAX1497
MAX1499
NAME
FUNCTION
25
25
VLED
LED-Display Segment-Driver Supply. Connect to a +2.7V to +5.25V supply. Bypass with
a 0.1μF capacitor to GLED.
26
27
28
26
27
28
SEGF
SEGG
SEGDP
Segment F Driver
Segment G Driver
Segment DP Driver
—
6
AV
DD
Analog Positive Supply Voltage. Connect AV
DD
to a +2.7V to +5.25V power supply.
Bypass AV
DD
to GND with a 0.1μF capacitor.
—
7
DV
DD
Digital Positive Supply Voltage. Connect DV
DD
to a +2.7V to +5.25V power supply.
Bypass DV
DD
to GND with a 0.1μF capacitor.
Digit 4 Driver
—
19
DIG4
—
29
LED_EN
Active-High LED Enable. The MAX1499 LED display driver turns off when LED_EN is
driven to logic low. The MAX1499 LED display driver turns on when LED_EN is driven to
logic high.
—
30
LOWBATT
Low-Battery Voltage Monitor. When the LOWBATT input voltage is lower than 2.048V, the
LOWBATT bit in the status register is set to one.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX1499ECJ+ 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 4.5 Digit ADC w/LED Drivers RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1499ECJ+T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 4.5 Digit ADC w/LED Drivers RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1499ECJ-T 功能描述:模數(shù)轉(zhuǎn)換器 - ADC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1499EVC16 功能描述:模數(shù)轉(zhuǎn)換器 - ADC 3.5- and 4.5-Digit Single-Chip ADCs with LED Drivers and uC Interface RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 結(jié)構(gòu):Sigma-Delta 轉(zhuǎn)換速率:125 SPs to 8 KSPs 分辨率:24 bit 輸入類型:Differential 信噪比:107 dB 接口類型:SPI 工作電源電壓:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-32
MAX1499EVKIT 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 Evaluation Kit/Evaluation System for the MAX1499 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評(píng)估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
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