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參數資料
| 型號： | TS(X)8387MFB/C |
| 元件分類： | ADC |
| 英文描述： | 1-CH 8-BIT PROPRIETARY METHOD ADC, PARALLEL ACCESS, CQFP68 |
| 封裝： | CERAMIC, QFP-68 |
| 文件頁數： | 25/38頁 |
| 文件大小： | 617K |
| 代理商： | TS(X)8387MFB/C |
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TS8387
31/38
7.7.
OUT OF RANGE BIT
An Out of Range (OR) bit is furnished that goes to logical high state when the input exceeds the positive full scale or falls
below the negative full scale.
When the analog input exceeds the positive full scale, the digital outputs remain at high logical state, with OR at logical
one.
When the analog input falls below the negative full scale, the digital outputs remain at logical low state, with OR at logical
one.
7.8.
GRAY OR BINARY OUTPUT DATA FORMAT SELECT
The TS8387 internal regeneration latches indecision ( for inputs very close to latches threshold) may produce errors in
the logic encoding circuitry and lead to large amplitude output errors.
This is due to the fact that the latches are regenerating the internal analog residues into logical states with a finite volt-
age gain value (Av) within a given positive amount of time
D(t) :
Av= exp(
D(t)/t) , with t the positive feedback regeneration time constant.
The TS8387 has been designed for reducing the probability of occurence of such errors to approximately 10–18 (tar-
getted for the TS8387 at 500 MSPS).
A standard technique for reducing the amplitude of such errors down to +/–1 LSB consists in using Gray code format for
the digital output datas.
Though the TS8387 has been designed for featuring a Bit Error Rate of 10–18 with a binary output format, it is possible for
the user to select between the Binary or Gray output data format , in order to reduce the amplitude of such errors when
occuring, by storing Gray output codes.
Digital Datas format selection :
BINARY output format if GORB is floating or VCC.
GRAY output format if GORB is connected to ground (0V).
7.9.
DIODE PIN 49
The DIODE pin 49 is provided for die junction temperature monitoring.
The operating die junction temperature must be kept below145
°C, therefore an adequate cooling system has to be set
up.
The diode mounted transistor measured Vbe value as a function of junction temperature is given below.
V
oltage
(mV
olts)
Junction temperature (
°C)
550
600
650
700
750
800
20
40
60
80
100
120
140
7.10. OPTIONAL ADC GAIN CONTROL PIN 60 (Non accessible)
The ADC gain is by default not adjustable on the available versions.
However, the possibility exists to adjust the ADC gain by the means of the pin ( 60 ) .
NOTE : This pad is internally shorted to Ground, to avoid any noise immunity related problems on the ADC default ver-
sion.
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