參數(shù)資料
型號: MAX19708ETM+T
廠商: Maxim Integrated Products
文件頁數(shù): 20/37頁
文件大?。?/td> 0K
描述: IC ANLG FRNT END 48-TQFN
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝: 2,500
位數(shù): 10
通道數(shù): 4
功率(瓦特): 36.9mW
電壓 - 電源,模擬: 3V
電壓 - 電源,數(shù)字: 3V
封裝/外殼: 48-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 48-TQFN-EP(7x7)
包裝: 帶卷 (TR)
MAX19708
10-Bit, 11Msps, Ultra-Low-Power
Analog Front-End
______________________________________________________________________________________
27
12-Bit, Auxiliary Control DACs
The MAX19708 includes three 12-bit aux-DACs (DAC1,
DAC2, DAC3) with 1s settling time for controlling vari-
able-gain amplifier (VGA), automatic gain-control
(AGC), and automatic frequency-control (AFC) func-
tions. The aux-DAC output range is 0.1V to 2.56V.
During power-up, the VGA and AGC outputs (DAC2
and DAC3) are at zero. The AFC DAC (DAC1) is at 1.1V
during power-up. The aux-DACs can be independently
controlled through the SPI bus, except during SHDN
mode where the aux-DACs are turned off completely
and the output voltage is set to zero. In STBY and IDLE
modes the aux-DACs maintain the last value. On wakeup
from SHDN, the aux-DACs resume the last values.
Loading on the aux-DAC outputs should be carefully
observed to achieve specified settling time and stabili-
ty. The capacitive load must be kept to a maximum of
5pF including package and trace capacitance. The
resistive load must be greater than 200k
Ω. If capacitive
loading exceeds 5pF, then add a 10k
Ω resistor in
series with the output. Adding the series resistor helps
drive larger load capacitance (< 15pF) at the expense
of slower settling time.
10-Bit, 333ksps Auxiliary ADC
The MAX19708 integrates a 333ksps, 10-bit aux-ADC
with an input 4:1 multiplexer. In the aux-ADC mode reg-
ister, setting bit AD0 begins a conversion with the auxil-
iary ADC. Bit AD0 automatically clears when the
conversion is complete. Setting or clearing AD0 during
a conversion has no effect (see Table 12). Bit AD1
determines the internal reference of the auxiliary ADC
(see Table 13). Bits AD2 and AD3 determine the auxil-
iary ADC input source (see Table 14). Bits AD4, AD5,
and AD6 select the number of averages taken when a
single start-convert command is given. The conversion
time increases as the number of averages increases
(see Table 15). The conversion clock can be divided
down from the system clock by properly setting bits
AD7, AD8, and AD9 (see Table 16). The aux-ADC out-
put data can be written out of DOUT by setting bit
AD10 high (see Table 17).
The aux-ADC features a 4:1 input multiplexer to allow
measurements on four input sources. The input sources
are selected by AD3 and AD2 (see Table 14). Two of
the multiplexer inputs (ADC1 and ADC2) can be con-
nected to external sources such as an RF power detec-
tor like the MAX2208 or temperature sensor like the
MAX6613. The other two multiplexer inputs are internal
connections to VDD and OVDD that monitor the power-
supply voltages. The internal VDD and OVDD connec-
tions are made through integrated resistor-dividers that
yield VDD / 2 and OVDD / 2 measurement results. The
aux-ADC voltage reference can be selected between
an internal 2.048V bandgap reference or VDD (see
Table 13). The VDD reference selection is provided to
allow measurement of an external voltage source with a
full-scale range extending beyond the 2.048V level. The
input source voltage range cannot extend above VDD.
Table 12. Auxiliary ADC Convert
Table 13. Auxiliary ADC Reference
Table 14. Auxiliary ADC Input Source
AD0
SELECTION
0
Aux-ADC Idle (Default)
1
Aux-ADC Start-Convert
AD1
SELECTION
0
Internal 2.048V Reference (Default)
1
Internal VDD Reference
AD3
AD2
AUX-ADC INPUT SOURCE
0
ADC1 (Default)
0
1
ADC2
10
VDD / 2
11
OVDD / 2
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MAX19708EVCMOD2 功能描述:ADC / DAC多通道 Maxim Evaluation System RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40
MAX19708EVCMODU 功能描述:ADC / DAC多通道 10-bit 11Msps Ultra-Low-Power Analog Front-End RoHS:否 制造商:Texas Instruments 轉(zhuǎn)換速率: 分辨率:8 bit 接口類型:SPI 電壓參考: 電源電壓-最大:3.6 V 電源電壓-最小:2 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-40
MAX19708EVKIT 功能描述:數(shù)據(jù)轉(zhuǎn)換 IC 開發(fā)工具 Evaluation Kit for the MAX19705 MAX19706 MAX19707 MAX19708 RoHS:否 制造商:Texas Instruments 產(chǎn)品:Demonstration Kits 類型:ADC 工具用于評估:ADS130E08 接口類型:SPI 工作電源電壓:- 6 V to + 6 V
MAX1970EEE 功能描述:直流/直流開關(guān)調(diào)節(jié)器 RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
MAX1970EEE+ 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Dual 180 Out 1.4MHz 750mA Step-Down RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5