參數(shù)資料
型號(hào): MAX146BEAP+T
廠商: Maxim Integrated Products
文件頁(yè)數(shù): 10/24頁(yè)
文件大?。?/td> 0K
描述: IC ADC LP 12-BIT 133KSPS 20-SSOP
產(chǎn)品培訓(xùn)模塊: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝: 2,000
位數(shù): 12
采樣率(每秒): 133k
數(shù)據(jù)接口: MICROWIRE?,QSPI?,串行,SPI?
轉(zhuǎn)換器數(shù)目: 1
功率耗散(最大): 640mW
電壓電源: 單電源
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 20-SSOP(0.209",5.30mm 寬)
供應(yīng)商設(shè)備封裝: 20-SSOP
包裝: 帶卷 (TR)
輸入數(shù)目和類型: 8 個(gè)單端,單極;8 個(gè)單端,雙極;4 個(gè)差分,單極;4 個(gè)差分,雙極
MAX146/MAX147
+2.7V, Low-Power, 8-Channel,
Serial 12-Bit ADCs
18
______________________________________________________________________________________
Figure 13. Average Supply Current vs. Conversion Rate with
External Reference
1000
10,000
0.1
AVERAGE SUPPLY CURRENT
vs. CONVERSION RATE
WITH EXTERNAL REFERENCE
100
10
1
CONVERSION RATE (Hz)
AVERAGE
SUPPLY
CURRENT
(
A)
1
100
10
1k
10k
1M
100k
MAX146/47-13
VREF = VDD = 3.0V
RLOAD =
CODE = 101010100000
1 CHANNEL
8 CHANNELS
Figure 14b. MAX146 Supply Current vs. Conversion Rate,
FASTPD
10,000
1
0.1
1
AVERAGE SUPPLY CURRENT
vs. CONVERSION RATE
(USING FASTPD)
1000
100
10
CONVERSION RATE (Hz)
AVERAGE
SUPPLY
CURRENT
(
A)
100
1M
10
1k
10k
100k
MAX146/47-Fig14b
RLOAD =
CODE = 101010100000
8 CHANNELS
1 CHANNEL
Figure 14a. MAX146 Supply Current vs. Conversion Rate,
FULLPD
100
1
0.01
0.1
1
AVERAGE SUPPLY CURRENT
vs. CONVERSION RATE
(USING FULLPD)
10
CONVERSION RATE (Hz)
AVERAGE
SUPPLY
CURRENT
(
A)
100
10
1k
MAX146/47-Fig14a
RLOAD =
CODE = 101010100000
8 CHANNELS
1 CHANNEL
Figure 14c. Typical Reference-Buffer Power-Up Delay vs. Time
in Shutdown
2.0
0
0.001
0.01
0.1
1
10
TYPICAL REFERENCE-BUFFER POWER-UP
DELAY vs. TIME IN SHUTDOWN
1.5
1.0
0.5
TIME IN SHUTDOWN (s)
POWER-UP
DELAY
(ms)
MAX146/47-Fig14c
Power-Down Sequencing
The MAX146/MAX147 auto power-down modes can
save considerable power when operating at less than
maximum sample rates. Figures 13, 14a, and 14b show
the average supply current as a function of the sam-
pling rate. The following discussion illustrates the vari-
ous power-down sequences.
Lowest Power at up to 500
Conversions/Channel/Second
The following examples show two different power-down
sequences. Other combinations of clock rates, compen-
sation modes, and power-down modes may give lowest
power consumption in other applications.
Figure 14a depicts the MAX146 power consumption for
one or eight channel conversions utilizing full power-
down mode and internal-reference compensation. A
0.047F bypass capacitor at REFADJ forms an RC filter
with the internal 20k
reference resistor with a 0.9ms
time constant. To achieve full 12-bit accuracy, 10 time
constants or 9ms are required after power-up. Waiting
this 9ms in FASTPD mode instead of in full power-up
can reduce power consumption by a factor of 10 or
more. This is achieved by using the sequence shown in
Figure 15.
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