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參數(shù)資料
| 型號： | MAX1099CEAE+T |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 8/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC ADC 10BIT SERIAL 16-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)： | 10 |
| 采樣率（每秒）： | 900 |
| 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）： | 2.2mW |
| 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： | 16-SSOP（0.209"，5.30mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-SSOP |
| 包裝： | 帶卷 (TR) |
| 輸入數(shù)目和類型： | 6 個差分，單極 |
MAX1098/MAX1099
10-Bit Serial-Output Temperature Sensors
with 5-Channel ADC
16
______________________________________________________________________________________
ence reflects the power requirement of an internal refer-
ence buffer amplifier that can accommodate external
loads. Temperature conversions at 100% duty cycle
increase supply currents to 440A (400A) through
additional amplification, buffer, and bias circuitry that is
otherwise inactive.
Place the MAX1098/MAX1099 in a low-current power-
down state between conversions to conserve power.
Select standby, standby plus, or shutdown through bits
PM1 and PM0 of the initialization byte (Table 3).
The MAX1098/MAX1099 assume the shutdown power
mode when VDD is first applied.
Standby Mode
Standby mode turns off the MAX1098/MAX1099 ADC,
internal clock, and reference buffer amplifier. Special
circuitry for temperature conversions is also deactivat-
ed. Wake-up time is limited by the reference buffer
amplifier and the associated bypass capacitor (see
Internal Reference). When an external reference is
used, wake-up time is 0.1ms.
Standby-Plus Mode
Standby-plus mode is similar to the standby mode, but
the internal reference output buffer remains active to
shorten the wake-up time to 0.1ms for internal refer-
ence mode. When using an external reference, stand-
by-plus mode is equivalent to standby mode.
Shutdown Mode
Shutdown mode turns off all functions other than start-
up circuitry, thereby reducing typical supply current to
2A. Data registers are cleared. Use this power mode
when interconversion times are no less than 5ms.
Monitoring VDD
This mode of operation samples and converts the sup-
ply voltage, VDD/4, which is internally generated. The
reference voltage must be larger than VDD/8 for the
operation to work properly. From the result of a conver-
sion (CODE), CODE = 64 VDD / VREF.
Temperature Measurements
The MAX1098/MAX1099 perform temperature measure-
ments with internal or external diode-connected transis-
tors through a three-step process. First, the diode bias
current changes from 31.6A to 10A to produce a
temperature-dependent bias voltage difference, which
is amplified by a factor of 20 and converted to digital
format. Second, the bias current changes from 31.6A
to 100A, and the bias voltage difference is similarly
amplified by a factor of 20 and converted to digital for-
mat. Third, the intermediate results are subtracted to
achieve a digital output that is proportional to absolute
temperature in degrees Kelvin.
The reference voltage used in conjunction with tempera-
ture measurements is derived from the internal reference
source to ensure that 1LSB corresponds to 1/8 of a
degree. To convert to degrees Celsius, subtract 273.15
from the temperature inferred from the ADC output.
Temperature measurements require a conversion time
of 2.2ms.
Shield Output Buffer
The MAX1098/MAX1099 provide a shield output buffer
voltage at SHO that is approximately 0.6V (one diode
drop) above VDD/2. When performing temperature
measurements with an external diode, use this voltage
to suppress error-producing leakage currents (see
Remote Diode Shielding). Figure 7 shows the SHO out-
put circuit.
Applications Information
Remote Diode Selection
Temperature accuracy depends on having a good-
quality, diode-connected, small-signal transistor.
Accuracy has been experimentally verified for 2N3904
devices. CPUs and other ICs having on-board temper-
ature-sensing diodes can also be monitored if the
diode connections are floating.
Table 3. Power-Mode Selection
See Power Requirements in Electrical Characteristics.
PM1
PM0
MODE
0
Shutdown
0
1
Standby plus
1
0
Standby
1
Normal operation
5
A
SHO
VDD
2
Figure 7. SHO Output Circuit
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