TMS370 datasheet(70/73 Pages) TI

70 / 73 page

TMS370Cx6x

8-BIT MICROCONTROLLER

SPNS033C – SEPTEMBER 1995 – REVISED FEBRUARY 1997

POST OFFICE BOX 1443

• HOUSTON, TEXAS 77251–1443

analog-to-digital converter 1 (ADC1) (continued)

The ADC1 module allows complete freedom in design of the sources for the analog inputs. The period of the

sample time is user-defined so that the high-impedance can be accommodated without penalty to the

low-impedance sources. The sample period begins when the SAMPLE START bit of the ADC1 control register

(ADCTL.6) is set to 1. The end of the signal sample period occurs when the conversion bit (CONVERT START,

ADCTL.7) is set to 1. After a hold time, the converter will reset the SAMPLE START and CONVERT START bits,

signaling that a conversion has started and that the analog signal can be removed.

analog timing requirements

MIN

MAX

UNIT

tsu(S)

Setup time, analog to sample command

th(AN)

Hold time, analog input from start of conversion

18tc

tw(S)

Pulse duration, sample time per kilohm of source impedance†

µs/kΩ

† The value given is valid for a signal with a source impedance > 1 k

Ω. If the source impedance is < 1kΩ, use a minimum sampling time of 1µs.

Analog In

Sample Start

Convert Start

Analog Stable

th(AN)

tw(S)

tsu(S)

Figure 33. Analog Timing

Table 25 is designed to aid the user in referencing a device part number to a mechanical drawing. The table

shows a cross-reference of the device part number to the TMS370 generic package name and the associated

mechanical drawing by drawing number and name.

Table 25. TMS370Cx6x Family Package Type and Mechanical Cross-Reference

PKG TYPE

(mil pin spacing)

TMS370 GENERIC NAME

PKG TYPE NO. AND

MECHANICAL NAME

DEVICE PART NUMBERS

FN – 68 pin

(50-mil pin spacing)

PLASTIC LEADED CHIP CARRIER

(PLCC)

FN(S-PQCC-J**) PLASTIC J-LEADED

CHIP CARRIER

TMS370C067AFNA

TMS370C067AFNL

TMS370C067AFNT

TMS370C068AFNA

TMS370C068AFNL

TMS370C068AFNT

TMS370C069AFNA

TMS370C069AFNL

TMS370C069AFNT

TMS370C768AFNT

TMS370C769AFNT

FZ – 68 pin

(50-mil pin spacing)

CERAMIC LEADED CHIP CARRIER

(CLCC)

FZ(S-CQCC-J**) J-LEADED CERAMIC

CHIP CARRIER

SE370C768AFZT

SE370C769AFZT

TMS370 Datasheet(PDF) 70 Page - Texas Instruments

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