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| 型号： | MAX1497EAI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 3/33页 |
| 文件大小： | 0K |
| 描述： | IC ADC 3 1/2DIG W/LED DVR 28-SSO |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 位数： | 3.5 位 |
| 采样率（每秒）： | 5 |
| 数据接口： | MICROWIRE?，QSPI?，串行，SPI? |
| 转换器数目： | 1 |
| 电压电源： | 模拟和数字 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
| 输入数目和类型： | 1 个差分，双极 |
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MAX1497/MAX1499
3.5- and 4.5-Digit, Single-Chip ADCs with LED
Drivers and C 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 100V for the MAX1499
and 1mV for the MAX1497) with a sigma-delta ADC and
output the result to an LED or C. An additional
±200mV input range (one count is equal to 10V for the
MAX1499 and 100V 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 C using an
SPI-/QSPI-/MICROWIRE-compatible serial interface.
Data can either be sent directly to the display or to the
C 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 (AVDD + 0.3V) for the MAX1499, and
from VNEG to (VDD 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
VLED
LED-Display Segment-Driver Supply. Connect to a +2.7V to +5.25V supply. Bypass with
a 0.1F capacitor to GLED.
26
SEGF
Segment F Driver
27
SEGG
Segment G Driver
28
SEGDP
Segment DP Driver
—6
AVDD
Analog Positive Supply Voltage. Connect AVDD to a +2.7V to +5.25V power supply.
Bypass AVDD to GND with a 0.1F capacitor.
—7
DVDD
Digital Positive Supply Voltage. Connect DVDD to a +2.7V to +5.25V power supply.
Bypass DVDD to GND with a 0.1F capacitor.
—19DIG4
Digit 4 Driver
—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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相关代理商/技术参数 |
参数描述 |
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| MAX1497EPI | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX1497EPI+ | 功能描述:模数转换器 - ADC 3.5 Digit ADC w/LED Drivers RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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