Micrel, Inc.

MICRF112

March 2007

19

M9999-030107

(408) 944-0800

Tx112-1-315MHz ASK Bill of Materials

Item

Quantity

Ref

Part

PCB

Footprint

Mfg P/N

Manufacturer

1

1

C1

10µF

0805

GRM21BR60J106KE01L

muRata

2

1

C2

100pF

0603

GRM1885C1H101JA01D

muRata

3

1

C5

10pF

0603

GRM1885C1H1000JA01D

muRata

4

3

R1,R4,R6

(np)

5

5

C6,C8,C11,C12,C15

(np)

6

1

C7

4.7pF

0603

GRM1885C1H6R8JA01D

muRata

7

1

C10

0.1µF

0603

GRM188F51H104ZA01D

muRata

8

2

C13,C14

18pF

0603

GRM1885C1H180JA01D

muRata

9

2

J1,J2

CON3

TSHR-114-S-02-A-GT

10

1

L1

470nH

0805

0805CS-470XJB

Coilcraft

11

1

L4

150nH

0603

0603CS-R15XJB

Coilcraft

12

1

L5

ANTENNA

ANTENNA LOOP, Part of

PCB

13

1

R2

100k

Ω

0603

CRCW0603100KFKEA

Vishay

14

6

R3,R5,R7

R8,JPR1,JPR2

0

Ω

0603

CRC06030000Z0EA

Vishay

13

1

U1

MICRF112YMM10

MICRF112YM

Micrel

14

1

Y1

9.84375MHZ

XTAL

SA-9.84375-F-10-C-3-3

HIB

Table 3

FSK Operation

Table 2 and 3 describe the ASK operation for 433.92MHz and 315MHz.

Table 4 lists the component values that change between ASK or FSK operation. Please note that use of a high FSK data

rate may excite parasitic resonant modes with some crystal types. Recommended crystals from Table 2 and 3 are good

for both ASK and FSK.

Mode

R1

R2

R5

R6

JPR1

JPR2

C8

ASK

NP

100k

Ω

0

Ω

NP

0

Ω

NP

NP

FSK

0

Ω

NP

NP

100k

Ω

NP

0

Ω

(1)3.3pF

(2)10pF

Notes:

1.

C8 = 3.3pF for 1kHz using HC49/U or HC49US type crystals.

2.

C8= 10pF for 10kHz using HC49/U, (high profile) only.

Table 4: ASK and FSK Settings

R3

R4

Constant ON

0

Ω

NP

External Standby Control

NP

100k

Ω

Table 5: Enable Control (Shutdown)