2252-DEMO THAT Corporation, 2252-DEMO Datasheet
2252-DEMO
Specifications of 2252-DEMO
Related parts for 2252-DEMO
2252-DEMO Summary of contents
Page 1
... Fig ure 1. 2252 Equiv a lent Cir cuit Di a gram dbx is a reg is tered trade mark of Car il lon Elec tron ics Cor po ra tion THAT Corporation; 45 Sumner Street; Milford, Massachusetts 01757-1656; USA Doc. 600032 Rev. 02 Tel: +1 508 478 9200; Fax: +1 508 478 0990; Web: www.thatcorp.com ...
Page 2
... I 100 A — 100nA in Re — CHIP CHIP = +15V -15V. Test cir cuit is as shown in Fig ure 4. SYM is ad justed for 100 Hz. THAT 2252 RMS-Level De tec tor 330 mW -20 to +75°C -40 to +125°C Typ Max Units +12 +15 V -12 - — 7 Typ ...
Page 3
... See Figure 3 for definitions of these currents. Logging Action OA2, together with Q4 and Q5, forms a log ampli- fier. By using two diode-connected transistors in the feedback loop of OA2, the 2252 produces a voltage proportional to twice the log of IC4 at the output of OA2. This voltage, V portional to the log of the square of the input cur- rent, plus a bias voltage (V2) ...
Page 4
... The time response for typical values of I (the circuit of Figure 4) is shown in Figure 5, which shows the 2252’s response to a 100 ms, 1 kHz tone burst at ~ +10 dBV followed by ~500 kHz at ~ –30 dBV. The top trace is ...
Page 5
... BIAS from the try of the tran sis tors in volved. Fig ure 6 plots out put volt age ver sus in put level for a 2252 in its rec om mended cir cuit con fig u ra tion is the R (Fig ure 4). In this plot, 0 dBr plots out put volt age for sev eral dif fer ent con - stant-amplitude fre quency sweeps for the same cir - cuit ...
Page 6
... Q4 and Q5. The cir cuit of Fig ure 4 uses sup ply in creas ing dc in put cur rent as the 2252 out put drops. This forces cur rent to flow in Q2, which over whelms any neg a tive in put bias at OA2 and pre vents the cur rent in Q4 and Q5 from re - vers ing ...
Page 7
... I will be 10 mA. peak charg ing cur rent called for would be 100 mA. The de vices within the 2252 will not sup port this high a cur rent de mand, so tim ing will be less rate un der this con di tion. (The steady-state out - put volt age will rate, since over time the er ror will be “ ...
Page 8
... This mod u la tion adds sig nal volt age (as rip ple) to the out put at pin 7. (Re call that, ide ally, the 2252 pro - duces rip ple only at the sec ond har monic of the in - put sig nal ...
Page 9
... Rev 02 re sponse is quite im por tant, the 2252s may lected, and Rf may be omit ted, as shown in Fig - ure 11. The 2252s should be se lected on the ba sis rate low-level, low-frequency per for mance (see Fig ure 8, page 6). The cir cuit of Fig ure 11 may also be used with lected 2252s for ap pli ca tions where ac cu rate low-level per for mance is un nec es sary ...
Page 10
... Log Am pli fier above), and fol lowed by a peak hold am pli fier. The ad van tage of us ing the 2252 for this ap pli ca tion is that the 2252 pro vides rec tion and log ging be fore the peak de tec tor, which al lows ex tremely wide dy namic range in the re sult ing sig - nal ...