參數(shù)資料
型號： MAX1221BETX+
廠商： Maxim Integrated Products
文件頁數(shù)： 33/44頁
文件大小： 0K
描述： IC ADC/DAC 12BIT W/FIFO 36TQFNEP
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 50
類型： ADC，DAC
分辨率（位）： 12 b
采樣率（每秒）： 225k
數(shù)據(jù)接口： MICROWIRE?，QSPI?，串行，SPI?
電壓電源： 模擬和數(shù)字
電源電壓： 2.7 V ~ 5.25 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 36-WFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝： 36-TQFN 裸露焊盤（6x6）
包裝： 管件
MAX1221/MAX1223/MAX1343
12-Bit, Multichannel ADCs/DACs with FIFO,
Temperature Sensing, and GPIO Ports
______________________________________________________________________________________
39
GPIO INPUT/OUTPUT
CS
tGSU
tGOD
Figure 13. GPIO Timing
LDAC
tLDACPWL
tS
OUT_
±1 LSB
Figure 14.
LDAC Functionality
Layout, Grounding, and Bypassing
For best performance, use PC boards. Ensure that digital
and analog signal lines are separated from each other.
Do not run analog and digital signals parallel to one
another (especially clock signals) or do not run digital
lines underneath the MAX1221/MAX1223/MAX1343
package. High-frequency noise in the AVDD power sup-
ply may affect performance. Bypass the AVDD supply
with a 0.1F capacitor to AGND, close to the AVDD pin.
Bypass the DVDD supply with a 0.1F capacitor to
DGND, close to the DVDD pin. Minimize capacitor lead
lengths for best supply-noise rejection. If the power sup-
ply is very noisy, connect a 10Ω resistor in series with the
supply to improve power-supply filtering.
The MAX1221/MAX1223/MAX1343 thin QFN packages
contain an exposed pad on the underside of the device.
Connect this exposed pad to AGND. Refer to the
MAX1258EVKIT for an example of proper layout.
Definitions
Integral Nonlinearity
Integral nonlinearity (INL) is the deviation of the values
on an actual transfer function from a straight line. This
straight line can be either a best-straight-line fit or a line
drawn between the end points of the transfer function,
once offset and gain errors have been nullified. INL for
the MAX1221/MAX1223/MAX1343 is measured using
the end-point method.
Differential Nonlinearity
Differential nonlinearity (DNL) is the difference between
an actual step width and the ideal value of 1 LSB. A
DNL error specification of less than 1 LSB guarantees
no missing codes and a monotonic transfer function.
Unipolar ADC Offset Error
For an ideal converter, the first transition occurs at 0.5
LSB, above zero. Offset error is the amount of deviation
between the measured first transition point and the
ideal first transition point.
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